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Note: This page contains sample records for the topic "rectifier power control" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


1

Minimization of DC Reactor and Operation Characteristics of Direct-Power-Controlled Current-Source PWM Rectifier  

E-Print Network [OSTI]

Minimization of DC Reactor and Operation Characteristics of Direct-Power-Controlled Current control; hence inductance of the DC reactor can be reduced. Feasibility of the strategy is verified characteristics of the direct power control based current-source PWM rectifier with a miniaturized DC reactor

Fujimoto, Hiroshi

2

Input Power Measurement Techniques for Single-Phase Digitally Controlled PFC Rectifiers  

E-Print Network [OSTI]

, and the increasing need for smart power management have lead to the need for energy submetering in many energy during lower power operation. Energy metering IC's [l1]-[3]1 could be used along with shunt and series

3

NONLINEAR-CARRIER CONTROL FOR HIGH-POWER-FACTOR RECTIFIERS BASED ON  

E-Print Network [OSTI]

, flyback, Cuk and Sepic converters offer the benefits of single-stage transformer isolation, voltage step-up-power- factor rectification. A simple exponential carrier waveform generator is described. Using the NLC con generator is discussed in Section 4. Design-oriented har- monic distortion analysis and modeling aspects

4

Design and evaluation of a cellular rectifier system with distributed control  

E-Print Network [OSTI]

This paper presents the design and experimental evaluation of a six-cell 6 kW cellular (parallel) rectifier system which operates at nearly unity power factor. The cellular rectifier system implements both distributed load ...

Perreault, David J.

5

SiC MOSFET Based Single Phase Active Boost Rectifier with Power Factor Correction for Wireless Power Transfer Applications  

SciTech Connect (OSTI)

Wireless Power Transfer (WPT) technology is a novel research area in the charging technology that bridges the utility and the automotive industries. There are various solutions that are currently being evaluated by several research teams to find the most efficient way to manage the power flow from the grid to the vehicle energy storage system. There are different control parameters that can be utilized to compensate for the change in the impedance due to variable parameters such as battery state-of-charge, coupling factor, and coil misalignment. This paper presents the implementation of an active front-end rectifier on the grid side for power factor control and voltage boost capability for load power regulation. The proposed SiC MOSFET based single phase active front end rectifier with PFC resulted in >97% efficiency at 137mm air-gap and >95% efficiency at 160mm air-gap.

Onar, Omer C [ORNL] [ORNL; Tang, Lixin [ORNL] [ORNL; Chinthavali, Madhu Sudhan [ORNL] [ORNL; Campbell, Steven L [ORNL] [ORNL; Miller (JNJ), John M. [JNJ-Miller PLC] [JNJ-Miller PLC

2014-01-01T23:59:59.000Z

6

Automotive Power Generation and Control  

E-Print Network [OSTI]

This paper describes some new developments in the application of power electronics to automotive power generation and control. A new load-matching technique is introduced that uses a simple switched-mode rectifier to achieve ...

Caliskan, Vahe

7

Design and Realization of Autonomous Power CMOS Single Phase Inverter and Rectifier for Low Power Conditioning Applications  

E-Print Network [OSTI]

Design and Realization of Autonomous Power CMOS Single Phase Inverter and Rectifier for Low Power operate as an inverter or as a rectifier in a wide range of power flows and input voltages. Three of the inverter reaches up to 92% as a function of input voltage with these conditions. The second experimental

Paris-Sud XI, Université de

8

Damping of a parallel ac-dc power system using PID power system stabilizers and rectifier current regulators  

SciTech Connect (OSTI)

A novel approach is presented to improve the dynamic stability of a parallel AC-DC power system. The developed scheme employs a proportional-integral-derivative (PID) power system stabilizer (PSS) and a PID rectifier current regulator (RCR) to enhance the damping for the electromagnetical mode of the system. The parameters of the proposed PID controllers are determined using a unified approach based on modal control theory. Eigenvalue analyses are performed for the system under various operating conditions in order to compare the damping effects provided by the two different control schemes. To demonstrate the effectiveness of the proposed damping schemes under disturbance conditions simulated dynamic response tests based on a nonlinear system model are also performed.

Hsu, Y.Y.; Wang, L. (Dept. of Electrical Engineering, National Taiwan Univ., Taipei (TW))

1988-09-01T23:59:59.000Z

9

THREE-PHASE CONTROLLED RECTIFIERS Author : Juan Dixon (Ph.D.)  

E-Print Network [OSTI]

uses three, common-cathode thyristor arrangement. In this figure, the power supply, and the transformer also) present a dc component that is undesirable, and makes this rectifier not useful for high power The currents waveforms shown in figure 12.5 are useful for the design of the power transformer. Starting from

Catholic University of Chile (Universidad Católica de Chile)

10

Rectifier cabinet static breaker  

DOE Patents [OSTI]

A rectifier cabinet static breaker replaces a blocking diode pair with an SCR and the installation of a power transistor in parallel with the latch contactor to commutate the SCR to the off state. The SCR serves as a static breaker with fast turnoff capability providing an alternative way of achieving reactor scram in addition to performing the function of the replaced blocking diodes. The control circuitry for the rectifier cabinet static breaker includes on-line test capability and an LED indicator light to denote successful test completion. Current limit circuitry provides high-speed protection in the event of overload.

Costantino, Jr, Roger A. (Mifflin, PA); Gliebe, Ronald J. (Library, PA)

1992-09-01T23:59:59.000Z

11

A new high performance AC to DC rectifier with input power factor correction and harmonic reduction capacity  

E-Print Network [OSTI]

Many conventional switching power supplies in data processing equipment and low power motor drive systems operate by rectifying the input ac line voltage and filtering it with large electrolytic capacitors. Because this process involves both...

Martinez, Roberto

1994-01-01T23:59:59.000Z

12

Voltage Sequence Control Based High-Current Rectifier System  

E-Print Network [OSTI]

of transformer. A passive filter is added at the primary side to achieve power factor improvement over the range of output voltage. This scheme is optimized to determine optimum turns ratio of the transformer and optimum not enforce unity power factor operation and guidelines provided by harmonic standards such as IEEE-519

Paderborn, Universität

13

Microwave Metamaterial Applications using Complementary Split Ring Resonators and High Gain Rectifying Reflectarray for Wireless Power Transmission  

E-Print Network [OSTI]

. ..................................................................................... 50 Fig. 28. (a) Half-wave rectifier with capacitor and (b) its waveforms ............................ 52 Fig. 29. Diode current-voltage characteristic curves with the incident fundamental and diode junction voltage waveforms... and 1930?s. In the 1950?s, the development of high power and efficiency micrwave tube by Raytheon Company [18] opened the modern WPT era. The first rectenna was invented in the 1960?s by combining a half-wave dipole antenna and a single diode by W...

Ahn, Chi Hyung

2011-10-21T23:59:59.000Z

14

International Rectifier Power Control Systems | Open Energy Information  

Open Energy Info (EERE)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data CenterFranconia, Virginia: Energy Resources Jump to:46 - 429 Throttled (bot load)International AssociationServices Ltd

15

Microwave and millimeter-wave rectifying circuit arrays and ultra-wideband antennas for wireless power transmission and communications  

E-Print Network [OSTI]

transmission have been developed. Unlike the traditional rectifying circuit using a single diode, dual diodes are used to double the DC output voltage with the same circuit layout dimensions. The rectenna components are then combined to form rectenna arrays...

Ren, Yu-Jiun

2009-05-15T23:59:59.000Z

16

612 IEEE TRANSACTIONS ON POWER ELECTRONICS, VOL. 26, NO. 2, FEBRUARY 2011 Self-Contained Resonant Rectifier for Piezoelectric  

E-Print Network [OSTI]

mechanical vibrations into electrical power. The improve- ment is achieved by a resonant circuit that self. Electrical equivalent circuit of capacitive current source driving a load. research has been made of the output current by the output capacitor. A low-consumption circuit synchronously controls the operation

17

Design and Evaluation of a 42-V Automotive Alternator With Integrated Switched-Mode Rectifier  

E-Print Network [OSTI]

This paper presents techniques for the design of high-power Lundell alternators with integrated switched-mode rectifiers. A multisection stator winding and interleaved rectifier arrangement is introduced that enables high ...

Tang, Sai Chun

18

Power Systems Control Architecture  

SciTech Connect (OSTI)

A diagram provided in the report depicts the complexity of the power systems control architecture used by the national power structure. It shows the structural hierarchy and the relationship of the each system to those other systems interconnected to it. Each of these levels provides a different focus for vulnerability testing and has its own weaknesses. In evaluating each level, of prime concern is what vulnerabilities exist that provide a path into the system, either to cause the system to malfunction or to take control of a field device. An additional vulnerability to consider is can the system be compromised in such a manner that the attacker can obtain critical information about the system and the portion of the national power structure that it controls.

James Davidson

2005-01-01T23:59:59.000Z

19

Modeling of Electronically Commutated Motor Controlled Fan-powered Terminal Units  

E-Print Network [OSTI]

Feet Per Minute ECM Electronically Commutated Motor FPTU Fan Powered Terminal Unit Pdown Downstream Static Pressure PF Power Factor Pup Upstream Static Pressure SCR Silicon Controlled Rectifier THD Total Harmonic Distortion VAV Variable Air... parallel unit pressurizes the FPTU causing some of the primary air to leak out of the unit. Another difference between them is that series terminal units allow the primary air system to operate at a lower static pressure because the terminal unit fan...

Edmondson, Jacob Lee

2011-02-22T23:59:59.000Z

20

High-Efficiency Harmonically-Terminated Rectifier for Wireless Powering Applications Michael Roberg, Erez Falkenstein and Zoya Popovic  

E-Print Network [OSTI]

, Erez Falkenstein and Zoya Popovic Department of Electrical, Computer and Energy Engineering, University effect on overall system efficiency. This paper presents an approach to high-efficiency microwave high-power directive wireless beaming, e.g. [I], and low-power harvesting, e.g. [2]. Other applications

Popovic, Zoya

Note: This page contains sample records for the topic "rectifier power control" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


21

6.334 Power Electronics, Spring 2003  

E-Print Network [OSTI]

The application of electronics to energy conversion and control; phase-controlled rectifier/inverter circuits, dc/dc converters, high-frequency inverters, and motion control systems. Characteristics of power semiconductor ...

Perreault, David John

22

InAsGaPInGaP high-temperature power Schottky rectifier and J. M. Woodall  

E-Print Network [OSTI]

°C. Further improvement of the thermal stability is expected to be achieved by reducing the diffusion is thought to be due to strong covalent bonding at the InAs/GaP interface. The InAs/GaP heterointerface effectively blocks impurity diffusion. Since InGaP is superior to GaP for high-power applica- tions, as shown

Woodall, Jerry M.

23

Stirling engine power control  

DOE Patents [OSTI]

A power control method and apparatus for a Stirling engine including a valved duct connected to the junction of the regenerator and the cooler and running to a bypass chamber connected between the heater and the cylinder. An oscillating zone of demarcation between the hot and cold portions of the working gas is established in the bypass chamber, and the engine pistons and cylinders can run cold.

Fraser, James P. (Scotia, NY)

1983-01-01T23:59:59.000Z

24

Control strategies for offshore wind farms based on PMSG wind turbines and HVdc connection with uncontrolled rectifier .  

E-Print Network [OSTI]

??The selection of the bulk power transmission technology in offshore wind farms is strongly related to the wind farm size and its distance to shore.… (more)

RODRÍGUEZ D'DERLÉE, JOHEL JOSÉ

2013-01-01T23:59:59.000Z

25

Dynamic Reactive Power Control of Isolated Power Systems  

E-Print Network [OSTI]

This dissertation presents dynamic reactive power control of isolated power systems. Isolated systems include MicroGrids in islanded mode, shipboard power systems operating offshore, or any other power system operating in islanded mode intentionally...

Falahi, Milad

2012-10-03T23:59:59.000Z

26

Digital regulation of a phase controlled power converter  

SciTech Connect (OSTI)

The Relativistic Heavy Ion Collider, now in construction at Brookhaven National Laboratory, will use phase controlled power converters for the main dipole and quadrupole magnet strings. The rectifiers in these power supplies will be controlled by a digital regulator based on the TI 320C30 Digital Signal Processor (DSP). The DSP implements the current loop, the voltage loop, and a system to actively reduce the sub-harmonic ripple components. Digital firing circuits consisting of a phase locked lop and counters are used to fire the SCRs. Corrections for the sub-harmonic reduction are calculated by the DSP and stored in registers in the firing circuit. These corrections are added in hardware, to the over-all firing count provided by the DSP. the resultant count is compared to a reference counter to fire the SCRs. This combination of a digital control system and the digital firing circuits allows the correction of the sub-harmonics in a real-time sense. A prototype of the regulator has been constructed, and the preliminary testing indicates a sub-harmonic reduction of 60 dB.

Schultheiss, C.; Haque, T.

1995-12-01T23:59:59.000Z

27

Power control for heat engines  

DOE Patents [OSTI]

A power control arrangement for a Stirling engine includes a sleeve mounted in each cylinder for axial movement and a port in the sleeve leading to a dead space. The port is covered by the piston at a position that is determined by the piston position and the axial adjustment of the sleeve. The compression phase of the Stirling cycle for that piston begins when the port is covered, so the position of the sleeve is used to set the Stirling engine power level.

Dineen, John J. (Durham, NH)

1984-01-01T23:59:59.000Z

28

Reducing Power Load Fluctuations on Ships Using Power Redistribution Control  

E-Print Network [OSTI]

controller is demonstrated through simulation studies on a supply vessel power plant, using the SIMULINK plant with electric propulsion, the power generation will con- sist of multiple engines, whereReducing Power Load Fluctuations on Ships Using Power Redistribution Control Damir Radan,1 Asgeir J

Johansen, Tor Arne

29

Adaptive excitation control in power systems  

E-Print Network [OSTI]

This thesis presents an adaptive excitation controller of power systems. The control law is derived by using model reference adaptive control (MRAC) or adaptive pole placement control (APPC) and an equilibrium tracking mechanism is implemented...

Chiu, Pei-Chen

2006-08-16T23:59:59.000Z

30

Active Power Control from Wind Power (Presentation)  

SciTech Connect (OSTI)

In order to keep the electricity grid stable and the lights on, the power system relies on certain responses from its generating fleet. This presentation evaluates the potential for wind turbines and wind power plants to provide these services and assist the grid during critical times.

Ela, E.; Brooks, D.

2011-04-01T23:59:59.000Z

31

Active Power Controls from Wind Power: Bridging the Gaps  

SciTech Connect (OSTI)

This paper details a comprehensive study undertaken by the National Renewable Energy Laboratory, Electric Power Research Institute, and the University of Colorado to understand how the contribution of wind power providing active power control (APC) can benefit the total power system economics, increase revenue streams, improve the reliability and security of the power system, and provide superior and efficient response while reducing any structural and loading impacts that may reduce the life of the wind turbine or its components. The study includes power system simulations, control simulations, and actual field tests using turbines at NREL's National Wind Technology Center (NWTC). The study focuses on synthetic inertial control, primary frequency control, and automatic generation control, and analyzes timeframes ranging from milliseconds to minutes to the lifetime of wind turbines, locational scope ranging from components of turbines to large wind plants to entire synchronous interconnections, and additional topics ranging from economics to power system engineering to control design.

Ela, E.; Gevorgian, V.; Fleming, P.; Zhang, Y. C.; Singh, M.; Muljadi, E.; Scholbrook, A.; Aho, J.; Buckspan, A.; Pao, L.; Singhvi, V.; Tuohy, A.; Pourbeik, P.; Brooks, D.; Bhatt, N.

2014-01-01T23:59:59.000Z

32

Power control system and method  

DOE Patents [OSTI]

A power system includes an energy harvesting device, a battery coupled to the energy harvesting device, and a circuit coupled to the energy harvesting device and the battery. The circuit is adapted to deliver power to a load by providing power generated by the energy harvesting device to the load without delivering excess power to the battery and to supplement the power generated by the energy harvesting device with power from the battery if the power generated by the energy harvesting device is insufficient to fully power the load. A method of operating the power system is also provided.

Steigerwald, Robert Louis (Burnt Hills, NY) [Burnt Hills, NY; Anderson, Todd Alan (Niskayuna, NY) [Niskayuna, NY

2008-02-19T23:59:59.000Z

33

Power control system and method  

DOE Patents [OSTI]

A power system includes an energy harvesting device, a battery coupled to the energy harvesting device, and a circuit coupled to the energy harvesting device and the battery. The circuit is adapted to deliver power to a load by providing power generated by the energy harvesting device to the load without delivering excess power to the battery and to supplement the power generated by the energy harvesting device with power from the battery if the power generated by the energy harvesting device is insufficient to fully power the load. A method of operating the power system is also provided.

Steigerwald, Robert Louis; Anderson, Todd Alan

2006-11-07T23:59:59.000Z

34

Recovery Act: High-Efficiency, Wideband Three-Phase Rectifiers and Adaptive Rectifier Management for Telecomm Central Office and Large Data Center Applications  

SciTech Connect (OSTI)

Lineage Power and Verizon teamed up to address a DOE funding opportunity focused on improving the power conversion chain in telecommunications facilities and data centers. The project had three significant elements: the design and development of high efficiency and high power three-phase rectifiers by Lineage Power, design and development of software to optimize overall plant energy efficiency by Lineage Power, and a field trial in active Verizon telecommunications facilities where energy consumption was measured before and after efficiency upgrades.

Mark A. Johnson

2012-06-29T23:59:59.000Z

35

PO. 254 Control of Power Train Loads  

E-Print Network [OSTI]

Abstract summary Variable loads along the power train are the primary cause attributed to the failure of gears, bearings, and other mechanical components. The concept of anticipatory control applied to a wind power train is presented. This new approach to power train load management is based on the data reflecting the current status of the power train. The model driving the optimization of the power train loads considers four different objectives, including minimization of the torque variability and power maximization. A software tool for power train load management is presented. This new approach to power train load control is based on the data reflecting the current status of the power train. Such data is collected by a typical SCADA system. The model driving the optimization of the power train loads considers four different objectives, including minimization of the torque variability and power maximization. Details of the model that is applicable to different turbines are presented Objectives Goal: Transform a wind a farm into a wind power plant Example objectives: ? Minimization of the torque ramp rate ? Maximization of the power produced ? Maximization of the power quality Modify the shape of the power curve Methods Data mining/Knowledge discovery

Andrew Kusiak

36

A boron nitride nanotube peapod thermal rectifier  

SciTech Connect (OSTI)

The precise guidance of heat from one specific location to another is paramount in many industrial and commercial applications, including thermal management and thermoelectric generation. One of the cardinal requirements is a preferential conduction of thermal energy, also known as thermal rectification, in the materials. This study introduces a novel nanomaterial for rectifying heat—the boron nitride nanotube peapod thermal rectifier. Classical non-equilibrium molecular dynamics simulations are performed on this nanomaterial, and interestingly, the strength of the rectification phenomenon is dissimilar at different operating temperatures. This is due to the contingence of the thermal flux on the conductance at the localized region around the scatterer, which varies with temperature. The rectification performance of the peapod rectifier is inherently dependent on its asymmetry. Last but not least, the favourable rectifying direction in the nanomaterial is established.

Loh, G. C., E-mail: jgloh@mtu.edu [Department of Physics, Michigan Technological University, Houghton, Michigan 49931 (United States); Institute of High Performance Computing, 1 Fusionopolis Way, #16-16 Connexis, Singapore 138632 (Singapore); Baillargeat, D. [CNRS-International-NTU-Thales Research Alliance (CINTRA), 50 Nanyang Drive, Singapore 637553 (Singapore)

2014-06-28T23:59:59.000Z

37

Power Electronics Thermal Control (Presentation)  

SciTech Connect (OSTI)

Thermal management plays an important part in the cost of electric drives in terms of power electronics packaging. Very promising results have been obtained by using microporous coatings and skived surfaces in conjunction with single-phase and two-phase flows. Sintered materials and thermoplastics with embedded fibers show significant promise as thermal interface materials, or TIMs. Appropriate cooling technologies depend on the power electronics package application and reliability.

Narumanchi, S.

2010-05-05T23:59:59.000Z

38

Plasma instrumentation for fusion power reactor control  

SciTech Connect (OSTI)

Feedback control will be implemented in fusion power reactors to guard against unpredicted behavior of the plant and to assure desirable operation. In this study, plasma state feedback requirements for plasma control by systems strongly coupled to the plasma (magnet sets, RF, and neutral beam heating systems, and refueling systems) are estimated. Generic considerations regarding the impact of the power reactor environment on plasma instrumentation are outlined. Solutions are proposed to minimize the impact of the power reactor environment on plasma instrumentation. Key plasma diagnostics are evaluated with respect to their potential for upgrade and implementation as power reactor instruments.

Sager, G.T.; Bauer, J.F.; Maya, I.; Miley, G.H.

1985-07-01T23:59:59.000Z

39

Control power in perfect controlled teleportation via partially entangled channels  

E-Print Network [OSTI]

We analyze and evaluate perfect controlled teleportation via three-qubit entangled channels from the point of view of the controller. The key idea in controlled teleportation is that the teleportation is performed only with the participation of the controller. We calculate a quantitative measure of the controller's power and establish a lower bound on the control power required for controlled teleportation. We show that the maximally entangled GHZ state is a suitable channel for controlled teleportation of arbitrary single qubits - the controller's power meets the bound and the teleportation fidelity without the controller's permission is no better than the fidelity of a classical channel. We also construct partially entangled channels that exceed the bound for controlled teleportation of a restricted set of states called the equatorial states. We calculate the minimum entanglement required in these channels to exceed the bound. Moreover, we find that in these restricted controlled teleportation schemes, the partially entangled channels can outperform maximally entangled channels with respect to the controller's power. Our results provide a new perspective on controlled teleportation schemes and are of practical interest since we propose useful partially entangled channels.

Xi-Han Li; Shohini Ghose

2014-10-05T23:59:59.000Z

40

Variable pressure power cycle and control system  

DOE Patents [OSTI]

A variable pressure power cycle and control system that is adjustable to a variable heat source is disclosed. The power cycle adjusts itself to the heat source so that a minimal temperature difference is maintained between the heat source fluid and the power cycle working fluid, thereby substantially matching the thermodynamic envelope of the power cycle to the thermodynamic envelope of the heat source. Adjustments are made by sensing the inlet temperature of the heat source fluid and then setting a superheated vapor temperature and pressure to achieve a minimum temperature difference between the heat source fluid and the working fluid.

Goldsberry, Fred L. (Spring, TX)

1984-11-27T23:59:59.000Z

Note: This page contains sample records for the topic "rectifier power control" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


41

Magnetic Amplifier for Power Flow Control  

SciTech Connect (OSTI)

GENI Project: ORNL is developing an electromagnet-based, amplifier-like device that will allow for complete control over the flow of power within the electric grid. To date, complete control of power flow within the grid has been prohibitively expensive. ORNL’s controller could provide a reliable, cost-effective solution to this problem. The team is combining two types of pre-existing technologies to assist in flow control, culminating in a prototype iron-based magnetic amplifier. Ordinarily, such a device would require expensive superconductive wire, but the magnetic iron core of ORNL’s device could serve as a low-cost alternative that is equally adept at regulating power flow.

None

2012-02-24T23:59:59.000Z

42

INTEGRATED CONTROL OF NEXT GENERATION POWER SYSTEM  

SciTech Connect (OSTI)

Control methodologies provide the necessary data acquisition, analysis and corrective actions needed to maintain the state of an electric power system within acceptable operating limits. These methods are primarily software-based algorithms that are nonfunctional unless properly integrated with system data and the appropriate control devices. Components of the control of power systems today include protective relays, supervisory control and data acquisition (SCADA), distribution automation (DA), feeder automation, software agents, sensors, control devices and communications. Necessary corrective actions are still accomplished using large electromechanical devices such as vacuum, oil and gas-insulated breakers, capacitor banks, regulators, transformer tap changers, reclosers, generators, and more recently FACTS (flexible AC transmission system) devices. The recent evolution of multi-agent system (MAS) technologies has been reviewed and effort made to integrate MAS into next generation power systems. A MAS can be defined as ��a loosely-coupled network of problem solvers that work together to solve problems that are beyond their individual capabilities��. These problem solvers, often called agents, are autonomous and may be heterogeneous in nature. This project has shown that a MAS has significant advantages over a single, monolithic, centralized problem solver for next generation power systems. Various communication media are being used in the electric power system today, including copper, optical fiber and power line carrier (PLC) as well as wireless technologies. These technologies have enabled the deployment of substation automation (SA) at many facilities. Recently, carrier and wireless technologies have been developed and demonstrated on a pilot basis. Hence, efforts have been made by this project to penetrate these communication technologies as an infrastructure for next generation power systems. This project has thus pursued efforts to use specific MAS methods as well as pertinent communications protocols to imbed and assess such technologies in a real electric power distribution system, specifically the Circuit of the Future (CoF) developed by Southern California Edison (SCE). By modeling the behavior and communication for the components of a MAS, the operation and control of the power distribution circuit have been enhanced. The use of MAS to model and integrate a power distribution circuit offers a significantly different approach to the design of next generation power systems. For example, ways to control a power distribution circuit that includes a micro-grid while considering the impacts of thermal constraints, and integrating voltage control and renewable energy sources on the main power system have been pursued. Both computer simulations and laboratory testbeds have been used to demonstrate such technologies in electric power distribution systems. An economic assessment of MAS in electric power systems was also performed during this project. A report on the economic feasibility of MAS for electric power systems was prepared, and particularly discusses the feasibility of incorporating MAS in transmission and distribution (T&D) systems. Also, the commercial viability of deploying MAS in T&D systems has been assessed by developing an initial case study using utility input to estimate the benefits of deploying MAS. In summary, the MAS approach, which had previously been investigated with good success by APERC for naval shipboard applications, has now been applied with promising results for enhancing an electric power distribution circuit, such as the Circuit of the Future developed by Southern California Edison. The results for next generation power systems include better ability to reconfigure circuits, improve protection and enhance reliability.

None

2010-02-28T23:59:59.000Z

43

Modeling Combustion Control for High Power Diesel Mode Switching...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Combustion Control for High Power Diesel Mode Switching Modeling Combustion Control for High Power Diesel Mode Switching Poster presentation given at the 16th Directions in...

44

Study Shows Active Power Controls from Wind May Increase Revenues...  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

Study Shows Active Power Controls from Wind May Increase Revenues and Improve System Reliability Study Shows Active Power Controls from Wind May Increase Revenues and Improve...

45

622 IEEE JOURNAL OF SOLID-STATE CIRCUITS, VOL. 49, NO. 3, MARCH 2014 Co-Design of a CMOS Rectifier and Small Loop  

E-Print Network [OSTI]

622 IEEE JOURNAL OF SOLID-STATE CIRCUITS, VOL. 49, NO. 3, MARCH 2014 Co-Design of a CMOS Rectifier (EM) en- ergy into electrical DC power. This DC power is locally stored in a capacitor or battery

Serdijn, Wouter A.

46

Power Flow Controller for Renewables: Transformer-less Unified Power Flow Controller for Wind and Solar Power Transmission  

SciTech Connect (OSTI)

GENI Project: MSU is developing a power flow controller to improve the routing of electricity from renewable sources through existing power lines. The fast, innovative, and lightweight circuitry that MSU is incorporating into its controller will eliminate the need for a separate heavy and expensive transformer, as well as the construction of new transmission lines. MSU’s controller is better suited to control power flows from distributed and intermittent wind and solar power systems than traditional transformer-based controllers are, so it will help to integrate more renewable energy into the grid. MSU‘s power flow controller can be installed anywhere in the existing grid to optimize energy transmission and help reduce transmission congestion.

None

2012-02-08T23:59:59.000Z

47

Evaluation of SiC MOSFETs for a High Efficiency Three-Phase Buck Rectifier  

E-Print Network [OSTI]

-voltage DC (HVDC) distribution architecture in telecom and data centers was shown to have superior efficiency and reliability compared with the traditional AC architecture [1-2]. HVDC bus is usually set as 380 Vdc or 400 Vdc a high efficiency buck rectifier used in the first stage of HVDC architecture data center power supplies

Tolbert, Leon M.

48

Harmonic Analysis of a Three-Phase Diode Bridge Rectifier based on Sampled-Data Model  

E-Print Network [OSTI]

Harmonic Analysis of a Three-Phase Diode Bridge Rectifier based on Sampled-Data Model K. L. Lian. As demonstrated in the paper, the proposed method analytically evaluates harmonics, and obtains exact switching is to incorporate it into a harmonic power flow program to yield improved accuracy. Index Terms-- Diode Bridge

Lehn, Peter W.

49

Low power, scalable multichannel high voltage controller  

DOE Patents [OSTI]

A low voltage control circuit is provided for individually controlling high voltage power provided over bus lines to a multitude of interconnected loads. An example of a load is a drive for capillary channels in a microfluidic system. Control is distributed from a central high voltage circuit, rather than using a number of large expensive central high voltage circuits to enable reducing circuit size and cost. Voltage is distributed to each individual load and controlled using a number of high voltage controller channel switches connected to high voltage bus lines. The channel switches each include complementary pull up and pull down photo isolator relays with photo isolator switching controlled from the central high voltage circuit to provide a desired bus line voltage. Switching of the photo isolator relays is further controlled in each channel switch using feedback from a resistor divider circuit to maintain the bus voltage swing within desired limits. Current sensing is provided using a switched resistive load in each channel switch, with switching of the resistive loads controlled from the central high voltage circuit.

Stamps, James Frederick (Livermore, CA); Crocker, Robert Ward (Fremont, CA); Yee, Daniel Dadwa (Dublin, CA); Dils, David Wright (Fort Worth, TX)

2006-03-14T23:59:59.000Z

50

Low power, scalable multichannel high voltage controller  

DOE Patents [OSTI]

A low voltage control circuit is provided for individually controlling high voltage power provided over bus lines to a multitude of interconnected loads. An example of a load is a drive for capillary channels in a microfluidic system. Control is distributed from a central high voltage circuit, rather than using a number of large expensive central high voltage circuits to enable reducing circuit size and cost. Voltage is distributed to each individual load and controlled using a number of high voltage controller channel switches connected to high voltage bus lines. The channel switches each include complementary pull up and pull down photo isolator relays with photo isolator switching controlled from the central high voltage circuit to provide a desired bus line voltage. Switching of the photo isolator relays is further controlled in each channel switch using feedback from a resistor divider circuit to maintain the bus voltage swing within desired limits. Current sensing is provided using a switched resistive load in each channel switch, with switching of the resistive loads controlled from the central high voltage circuit.

Stamps, James Frederick (Livermore, CA); Crocker, Robert Ward (Fremont, CA); Yee, Daniel Dadwa (Dublin, CA); Dils, David Wright (Fort Worth, TX)

2008-03-25T23:59:59.000Z

51

MHD power plant instrumentation and control  

SciTech Connect (OSTI)

The Electric Power Research Institute (EPRI) has awarded a contract to the MHD Development Corporation (MDC) to develop instrumentation and control requirements and strategies for commercial MHD power plants. MDC subcontracted MSE to do the technical development required. MSE is being assisted by Montana State University (MSU) for the topping cycle development. A computer model of a stand-alone MHD/steam plant is being constructed. The plant is based on the plant design set forth in the MDC proposal to the Federal Clean Coal Technology 5 solicitation. It consists of an MHD topping plant, a Heat Recovery Seed Recovery (HRSR) plant, and a steam turbo-generator. The model is based on the computer code used for a study of the Corette plant retrofitted with an MHD plant. Additional control strategies, based on MHD testing results and current steam bottoming plant control data, will be incorporated. A model will be devised and implemented for automatic control of the plant. Requirements regarding instrumentation and actuators will be documented. Instrumentation and actuators that are not commercially available will be identified. The role and desired characteristics of an expert system in the automated control scheme is being investigated. Start-up and shutdown procedures will be studied and load change dynamic performance will be evaluated. System response to abnormal topping cycle and off-design system operation will be investigated. This includes use of MHD topping cycle models which couple gasdynamic and electrical behavior for the study of controlling of the MHD topping cycle. A curvefitter, which uses cubic Hermitian spline interpolation functions in as many as five dimensions, allows much more accurate reproduction of nonlinear, multidimensional functions. This project will be the first to investigate plant dynamics and control using as many as seven independent variables or control inputs to the MHD topping cycle.

Lofftus, D.; Rudberg, D. [MSE Inc., Butte, MT (United States); Johnson, R.; Hammerstrom, D. [Montana State Univ., Bozeman, MT (United States)

1993-12-31T23:59:59.000Z

52

NREL: News - NREL Study: Active Power Control of Wind Turbines...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

414 NREL Study: Active Power Control of Wind Turbines Can Improve Power Grid Reliability January 20, 2014 The Energy Department's National Renewable Energy Laboratory (NREL), along...

53

Modeling Combustion Control for High Power Diesel Mode Switching  

Broader source: Energy.gov (indexed) [DOE]

and Emissions Research Conference 2010 Modeling Combustion Control for High Power Diesel Mode Switching P-20 Motivation * High power LTC-diesel mode operation * Transient...

54

Intelligent Voltage and Reactive Power Control of Mini-Hydro Power Stations for Maximisation of Real  

E-Print Network [OSTI]

1 Intelligent Voltage and Reactive Power Control of Mini-Hydro Power Stations for Maximisation Control (APFC) modes. The ability to export active and reactive power from mini-hydro power generators electrical power generation from renewable resources. Additionally, the potential early retiral of central

Harrison, Gareth

55

Experience curves for power plant emission control technologies  

E-Print Network [OSTI]

reduction in NO x emissions from coal-fired power plants tocombustion of coal, emissions from coal-fired power plantsemission control technologies now required on all new coal-fired power

Rubin, Edward S.; Yeh, Sonia; Hounshell, David A

2007-01-01T23:59:59.000Z

56

Adaptive Power Control for Single and Multiuser Opportunistic Systems  

E-Print Network [OSTI]

In this dissertation, adaptive power control for single and multiuser opportunistic systems is investigated. First, a new adaptive power-controlled diversity combining scheme for single user systems is proposed, upon which is extended...

Nam, Sung Sik

2010-07-14T23:59:59.000Z

57

Auxiliary power controls on the Nelson River HVDC scheme  

SciTech Connect (OSTI)

This paper describes the auxiliary power controls on the Nelson River HVDC scheme. It shows how the fast control feature of the HVDC link can be utilized to enhance the operation of an integrated ac/dc power system.

Chand, J. (Manitoba Hydro, Winnipeg, Manitoba (CA))

1992-02-01T23:59:59.000Z

58

Distributed Power Flow Control: Distributed Power Flow Control using Smart Wires for Energy Routing  

SciTech Connect (OSTI)

GENI Project: Smart Wire Grid is developing a solution for controlling power flow within the electric grid to better manage unused and overall transmission capacity. The 300,000 miles of high-voltage transmission line in the U.S. today are congested and inefficient, with only around 50% of all transmission capacity utilized at any given time. Increased consumer demand should be met in part with more efficient and an economical power flow. Smart Wire Grid’s devices clamp onto existing transmission lines and control the flow of power within—much like how internet routers help allocate bandwidth throughout the web. Smart wires could support greater use of renewable energy by providing more consistent control over how that energy is routed within the grid on a real-time basis. This would lessen the concerns surrounding the grid’s inability to effectively store intermittent energy from renewables for later use.

None

2012-04-24T23:59:59.000Z

59

Hybrid Modeling and Control of a Hydroelectric Power Plant  

E-Print Network [OSTI]

Hybrid Modeling and Control of a Hydroelectric Power Plant Giancarlo Ferrari-Trecate, Domenico,mignone,castagnoli,morari}@aut.ee.ethz.ch Abstract In this work we present the model of a hydroelectric power plant in the framework of Mixed Logic with a model predictive control scheme. 1 Introduction The outflow control for hydroelectric power plants

Ferrari-Trecate, Giancarlo

60

National Spherical Torus Experiment (NSTX) Power Supply Real Time Controller  

E-Print Network [OSTI]

derivatives. II. POWER SUPPLIES & CIRCUITS TO BE CONTROLLED A. Power Supplies NSTX utilizes the PPPL "Power Supply Sections" (PSS) which are electrically isolated from each other but subject to the same "Firing PSS by phase controlling the thyristor firing pulses in accordance with a Control Word received

Note: This page contains sample records for the topic "rectifier power control" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


61

Energy Efficient Scheduling with Power Control for Wireless Networks  

E-Print Network [OSTI]

Energy Efficient Scheduling with Power Control for Wireless Networks Bastian Katz Institute the complexity of scheduling with power control in the SINRG model of interference. Based on a novel scheme) and less energy consumption: power control admits schedules that would otherwise violate interference

Paris-Sud XI, Université de

62

Centre Hydraulic Power Supply Unit University of Saskatchewan -Mechanical Engineering Fluid Power and Controls  

E-Print Network [OSTI]

Centre Hydraulic Power Supply Unit University of Saskatchewan - Mechanical Engineering ­ Fluid Power and Controls ID: FP0003 Rev: 001 Date: May 31, 2010 Page: 1 of 7 Centre Hydraulic Power Supply;Centre Hydraulic Power Supply Unit University of Saskatchewan - Mechanical Engineering ­ Fluid Power

Saskatchewan, University of

63

Nuclear Power - Control, Reliability and Human Factors  

E-Print Network [OSTI]

Instrumentation and Control 49 H.M. Hashemian Chapter 4 Design Considerations for the Implementation of a Mobile IP Telephony System in a Nuclear Power Plant 67 J. Garc?a-Hern?ndez, J. C. Vel?zquez- Hern?ndez, C. F. Garc?a-Hern?ndez and M. A. Vallejo-Alarc?n... Reliability K s e n i i a Sapoz h n i k o v a and Roald Tayma n o v D.I.Mendeleyev Institute for Metrology, Russia 1. Introduction At present, a great number of embedded sens o r devi c es provi d e monito r i n g of operat i n g condi t io n...

64

Control of Wind Turbines for Power Regulation and  

E-Print Network [OSTI]

Control of Wind Turbines for Power Regulation and Load Reduction Juan Jose Garcia Quirante Kongens regulation and load reduction and their ensemble in a variable-speed wind turbine. The power regulation aspects of mathematical modelling of wind turbines, and especially the control methods suited for power

65

Electric Power Controller for Steering Wheel Management in Electric Cars  

E-Print Network [OSTI]

Electric Power Controller for Steering Wheel Management in Electric Cars Vicente Milanés, Joshué-- Autonomous vehicles, Power control, System analysis and design, Intelligent transportation systems. I they are named hydraulic power steering (HPS) systems. If an electric motor is used then they are named electric

Paris-Sud XI, Université de

66

Controlled Use Robot Colony Power Supply Gary Parker  

E-Print Network [OSTI]

of charging solar panels a continuous power station. Brooks a robot, Attila, which batteries recharged panelsControlled Use Robot Colony Power Supply Gary Parker Computer Science Connecticut College New.S.A. rszbe@conncoll.edu Abstract ­ controlled of a continuous power supply robots colony presented. builds

Parker, Gary B.

67

Aerospace Power & Electronics Simulation Workshop 2004 Satellite Attitude Control  

E-Print Network [OSTI]

Aerospace Power & Electronics Simulation Workshop 2004 · Satellite Attitude Control System Design Using Reaction Wheels Bhanu Gouda Brian Fast Dan Simon #12;2Aerospace Power & Electronics Simulation;3Aerospace Power & Electronics Simulation Workshop 2004 ADCS ·ADCS: Attitude Determination and Control

Simon, Dan

68

Transient power control in dynamic positioning -governor feedforward and  

E-Print Network [OSTI]

other large power con- sumers are installed on a particular vessel. A diesel-driven power plant operatesTransient power control in dynamic positioning - governor feedforward and dynamic thrust allocation-mail: skjetne@ieee.org) Abstract: A thrust allocation algorithm with capability to assist the power management

Johansen, Tor Arne

69

Power Conditioning and Control Applications for Energy Conservation  

E-Print Network [OSTI]

Electrical power conditioning and control (PCC) systems are finding cost effective applications in AC motor drives, lamp ballasts and power supplies. Substantial system efficiency improvements are being realized when the appropriate PCC system...

Brushwood, J. S.

1982-01-01T23:59:59.000Z

70

National Spherical Torus Experiment (NSTX) Power Supply Real Time Controller  

E-Print Network [OSTI]

systems according to pre­programmed current derivatives. II. POWER SUPPLIES & CIRCUITS TO BE CONTROLLED isolated from each other but subject to the same "Firing Generator" (FG). Each PSS Magnets Power Supply

71

Dynamic Power Flow Controller: Compact Dynamic Phase Angle Regulators for Transmission Power Routing  

SciTech Connect (OSTI)

GENI Project: Varentec is developing compact, low-cost transmission power controllers with fractional power rating for controlling power flow on transmission networks. The technology will enhance grid operations through improved use of current assets and by dramatically reducing the number of transmission lines that have to be built to meet increasing contributions of renewable energy sources like wind and solar. The proposed transmission controllers would allow for the dynamic control of voltage and power flow, improving the grid’s ability to dispatch power in real time to the places where it is most needed. The controllers would work as fail-safe devices whereby the grid would be restored to its present operating state in the event of a controller malfunction instead of failing outright. The ability to affordably and dynamically control power flow with adequate fail-safe switchgear could open up new competitive energy markets which are not possible under the current regulatory structure and technology base.

None

2012-01-03T23:59:59.000Z

72

HYPower Hydraulic Power Supply Unit University of Saskatchewan -Mechanical Engineering Fluid Power and Controls  

E-Print Network [OSTI]

HYPower Hydraulic Power Supply Unit University of Saskatchewan - Mechanical Engineering ­ Fluid Power and Controls ID: FP0002 Rev: 002 Date: May 31, 2010 Page: 1 of 7 Hydraulic Power Supply (HYPower-5462 Secondary Contact: #12;HYPower Hydraulic Power Supply Unit University of Saskatchewan - Mechanical

Saskatchewan, University of

73

East Hydraulic Power Supply Unit University of Saskatchewan -Mechanical Engineering Fluid Power and Controls  

E-Print Network [OSTI]

East Hydraulic Power Supply Unit University of Saskatchewan - Mechanical Engineering ­ Fluid Power and Controls ID: FP0004 Rev: 001 Date: May 31, 2010 Page: 1 of 7 East Hydraulic Power Supply and Test Bench. Approved By: Primary Contact: Doug Bitner Rm: 1B15.1 966-5462 Secondary Contact: #12;East Hydraulic Power

Saskatchewan, University of

74

Control and Optimization Meet the Smart Power Grid: Scheduling of Power Demands for Optimal Energy  

E-Print Network [OSTI]

Control and Optimization Meet the Smart Power Grid: Scheduling of Power Demands for Optimal Energy technologies to enforce sensible use of energy through effective demand load management. We envision a scenario con- sumer power demand requests with different power require- ments, durations, and deadlines

Koutsopoulos, Iordanis

75

Power Control for Crossbar-based Input-Queued Switches  

E-Print Network [OSTI]

, if f is the maximum digital signal frequency, the power consumption of a CMOS device is proportional number of data simultaneously flowing across the switching fabric. Thermal power dissipation is becoming1 Power Control for Crossbar-based Input-Queued Switches Andrea Bianco, Paolo Giaccone, Guido

76

Centralized wind power plant voltage control with optimal power flow algorithm.  

E-Print Network [OSTI]

??This thesis presents a method of controlling the reactive power injected into a medium-voltage collection system by multiple wind turbine generators such that the voltage… (more)

Kline, Jared Andrew

2011-01-01T23:59:59.000Z

77

BATTERY STORAGE CONTROL FOR STEADYING RENEWABLE POWER GENERATION  

E-Print Network [OSTI]

pro- duction to come from renewable resources. In the 2011 State of the Union Address, President ObamaBATTERY STORAGE CONTROL FOR STEADYING RENEWABLE POWER GENERATION By Shengyuan (Mike) Chen, Emilie-626-7370 URL: http://www.ima.umn.edu #12;Battery Storage Control for Steadying Renewable Power Generation

78

Control Design for Interconnected Power Systems with OLTCs via Robust Decentralized Control  

E-Print Network [OSTI]

Control Design for Interconnected Power Systems with OLTCs via Robust Decentralized Control the problem of designing a decentralized control of interconnected power systems, with OLTC and SVCs, under-scale Markov jump parameter systems framework. In this paper, unlike other control schemes, OLTC transformers

Pota, Himanshu Roy

79

Advanced Power Systems and Controls Laboratory  

E-Print Network [OSTI]

photovoltaic generation facility. Solar panel output is in white, and the response of the XP DPR is in red Solar Power Generation Introduction The rapid growth of wind and solar power is a key driver of the development of grid-scale Battery Energy Storage Systems (BESS). A well implemented BESS co-located with solar

Ben-Yakar, Adela

80

Automatic reactor power control for a pressurized water reactor  

SciTech Connect (OSTI)

An automatic reactor power control system is presented for a pressurized water reactor (PWR). The associated reactor control strategy is called mode K.' The new system implements a heavy-worth bank dedicated to axial shape control, independent of the existing regulating banks. The heavy bank provides a monotonic relationship between its motion and the axial shape change, which allows automatic control of the axial power distribution. Thus, the mode K enables precise regulation of both the reactivity and the power distribution, by using double closed-loop control of the reactor coolant temperature and the axial power difference. Automatic reactor power control permits the nuclear power plant to accommodate the load-follow operations, including frequency control, to respond to the grid requirements. The mode K reactor control concepts were tested using simulation responses of a Korean standardized 1,000-MW (electric) PWR. The simulation results illustrate that the mode K would be a practical reactor power control strategy for the increased automation of nuclear plants.

Jungin Choi (Kyungwon Univ. (Korea, Republic of)); Yungjoon Hah (Korea Atomic Energy Research Inst., Daejeon (Korea, Republic of)); Unchul Lee (Seoul National Univ. (Korea, Republic of))

1993-05-01T23:59:59.000Z

Note: This page contains sample records for the topic "rectifier power control" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


81

Precision envelope detector and linear rectifier circuitry  

DOE Patents [OSTI]

Disclosed is a method and apparatus for the precise linear rectification and envelope detection of oscillatory signals. The signal is applied to a voltage-to-current converter which supplies current to a constant current sink. The connection between the converter and the sink is also applied through a diode and an output load resistor to a ground connection. The connection is also connected to ground through a second diode of opposite polarity from the diode in series with the load resistor. Very small amplitude voltage signals applied to the converter will cause a small change in the output current of the converter, and the difference between the output current and the constant current sink will be applied either directly to ground through the single diode, or across the output load resistor, dependent upon the polarity. Disclosed also is a full-wave rectifier utilizing constant current sinks and voltage-to-current converters. Additionally, disclosed is a combination of the voltage-to-current converters with differential integrated circuit preamplifiers to boost the initial signal amplitude, and with low pass filtering applied so as to obtain a video or signal envelope output.

Davis, Thomas J. (Richland, WA)

1980-01-01T23:59:59.000Z

82

Conservation Theory Process Control Using Variable Frequency Drives  

E-Print Network [OSTI]

name from the vari able DC voltage which the rectifier section pro duces. Variable DC voltage is required in order to produce controlled AC with the volts per hz ratio constant. To operate an AC motor over a speed range from 5-60 hz and still... be capable of producing con stant torque,the ratio: Volts ~ = Constant must be satisfied. The rectifier and inverter stages work in concert to produce variable voltage, variable frequency AC power. The linear relation ship between voltage and frequency...

Myers, N. S.

1980-01-01T23:59:59.000Z

83

Power Control and Transmission Scheduling for Network Utility Maximization in Wireless Networks  

E-Print Network [OSTI]

Power Control and Transmission Scheduling for Network Utility Maximization in Wireless Networks Min power control and transmis- sion scheduling problem in wireless networks with average power constraints. Index Terms--Network utility maximization, power control, transmission scheduling, column generation I

Sharma, Vinod

84

Bi-directional power control system for voltage converter  

DOE Patents [OSTI]

A control system for a voltage converter includes: a power comparator for comparing a power signal on input terminals of the converter with a commanded power signal and producing a power comparison signal; a power regulator for transforming the power comparison signal to a commanded current signal; a current comparator for comparing the commanded current signal with a measured current signal on output terminals of the converter and producing a current comparison signal; a current regulator for transforming the current comparison signal to a pulse width modulator (PWM) duty cycle command signal; and a PWM for using the PWM duty cycle command signal to control electrical switches of the converter. The control system may further include: a command multiplier for converting a voltage signal across the output terminals of the converter to a gain signal having a value between zero (0) and unity (1), and a power multiplier for multiplying the commanded power signal by the gain signal to provide a limited commanded power signal, wherein power comparator compares the limited commanded power signal with the power signal on the input terminals. 10 figs.

Garrigan, N.R.; King, R.D.; Schwartz, J.E.

1999-05-11T23:59:59.000Z

85

Bi-directional power control system for voltage converter  

DOE Patents [OSTI]

A control system for a voltage converter includes: a power comparator for comparing a power signal on input terminals of the converter with a commanded power signal and producing a power comparison signal; a power regulator for transforming the power comparison signal to a commanded current signal; a current comparator for comparing the commanded current signal with a measured current signal on output terminals of the converter and producing a current comparison signal; a current regulator for transforming the current comparison signal to a pulse width modulator (PWM) duty cycle command signal; and a PWM for using the PWM duty cycle command signal to control electrical switches of the converter. The control system may further include: a command multiplier for converting a voltage signal across the output terminals of the converter to a gain signal having a value between zero (0) and unity (1), and a power multiplier for multiplying the commanded power signal by the gain signal to provide a limited commanded power signal, wherein power comparator compares the limited commanded power signal with the power signal on the input terminals.

Garrigan, Neil Richard (Niskayuna, NY); King, Robert Dean (Schenectady, NY); Schwartz, James Edward (Slingerlands, NY)

1999-01-01T23:59:59.000Z

86

Flex power perspectives of indirect power system control through dynamic  

Open Energy Info (EERE)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home5b9fcbce19 NoPublicIDAPowerPlantSitingConstruction.pdfNotify98.pdf Jump to:Siting.pdfFiskdale,Five447753°, -84.1124406°power

87

IEEE TRANSACTIONS ON POWER ELECTRONICS 1 A Hybrid Power Control Concept for PV Inverters with Reduced  

E-Print Network [OSTI]

- cept for grid-connected Photovoltaic (PV) inverters. The control strategy is based on either a Maximum concept. Index Terms--Photovoltaic inverters, constant power genera- tion, maximum power point tracking, efficiency, thermal loading, reliability. I. INTRODUCTION MAXIMUM Power Point Tracking (MPPT) is effective

Kerekes, Tamas

88

EFFECT OF PITCH CONTROL AND POWER CONDITIONING ON POWER QUALITY OF VARIABLE SPEED WIND TURBINE GENERATORS  

E-Print Network [OSTI]

EFFECT OF PITCH CONTROL AND POWER CONDITIONING ON POWER QUALITY OF VARIABLE SPEED WIND TURBINE), Curtin University of Technology, WA Abstract: Variable speed wind turbine generators provide the opportunity to capture more power than fixed speed turbines. However the variable speed machine output can

89

An Approach to Autonomous Control for Space Nuclear Power Systems  

SciTech Connect (OSTI)

Under Project Prometheus, the National Aeronautics and Space Administration (NASA) investigated deep space missions that would utilize space nuclear power systems (SNPSs) to provide energy for propulsion and spacecraft power. The initial study involved the Jupiter Icy Moons Orbiter (JIMO), which was proposed to conduct in-depth studies of three Jovian moons. Current radioisotope thermoelectric generator (RTG) and solar power systems cannot meet expected mission power demands, which include propulsion, scientific instrument packages, and communications. Historically, RTGs have provided long-lived, highly reliable, low-power-level systems. Solar power systems can provide much greater levels of power, but power density levels decrease dramatically at {approx} 1.5 astronomical units (AU) and beyond. Alternatively, an SNPS can supply high-sustained power for space applications that is both reliable and mass efficient. Terrestrial nuclear reactors employ varying degrees of human control and decision-making for operations and benefit from periodic human interaction for maintenance. In contrast, the control system of an SNPS must be able to provide continuous operatio for the mission duration with limited immediate human interaction and no opportunity for hardware maintenance or sensor calibration. In effect, the SNPS control system must be able to independently operate the power plant while maintaining power production even when subject to off-normal events and component failure. This capability is critical because it will not be possible to rely upon continuous, immediate human interaction for control due to communications delays and periods of planetary occlusion. In addition, uncertainties, rare events, and component degradation combine with the aforementioned inaccessibility and unattended operation to pose unique challenges that an SNPS control system must accommodate. Autonomous control is needed to address these challenges and optimize the reactor control design.

Wood, Richard Thomas [ORNL; Upadhyaya, Belle R. [University of Tennessee, Knoxville (UTK)

2011-01-01T23:59:59.000Z

90

Integrated power unit control apparatus and method  

SciTech Connect (OSTI)

This patent describes control apparatus for a dual mode turbine engine, the turbine engine including a dynamic compressor supplying pressurized air to a combustor of the engine, and a storage source of pressurized air selectively flowing to the combustor via an air control valve; the control apparatus. It comprises: air flow control means receiving a signal CIP indicative of the pressure level of pressurized air at the combustor and in response thereto providing to the air control valve/a command signal Air/Fuel COMM indicative of a mass flow rate of air to be provided to the combustor from the storage source; and fuel control means receiving the Air/Fuel COMM signal and in response thereto providing a signal W{sub F} indicative of the weight of fuel per unit time to be provided to the combustor.

Klaass, R.M.; Minshall, B.J.; Suriano, F.J.; Caan, W.

1992-03-24T23:59:59.000Z

91

Control and Power Management of Converter Fed Microgrids  

E-Print Network [OSTI]

1 Control and Power Management of Converter Fed Microgrids Charles K. Sao, Member, IEEE, and Peter in parallel in a VSC fed microgrid. Each current controlled VSC in such a microgrid has its own VPD/FQB controller that sets its current references to regulate the voltage and frequency of a common microgrid bus

Lehn, Peter W.

92

Optimal Energy Storage Control Policies for the Smart Power Grid  

E-Print Network [OSTI]

Optimal Energy Storage Control Policies for the Smart Power Grid Iordanis Koutsopoulos Vassiliki Center for Research and Technology Hellas (CERTH), Greece Abstract--Electric energy storage devices the optimal energy storage control problem from the side of the utility operator. The operator controller

Koutsopoulos, Iordanis

93

Interleaved power converter  

DOE Patents [OSTI]

A power converter architecture interleaves full bridge converters to alleviate thermal management problems in high current applications, and may, for example, double the output power capability while reducing parts count and costs. For example, one phase of a three phase inverter is shared between two transformers, which provide power to a rectifier such as a current doubler rectifier to provide two full bridge DC/DC converters with three rather than four high voltage inverter legs.

Zhu, Lizhi (Canton, MI)

2007-11-13T23:59:59.000Z

94

A Power Control System for a Paper Mill  

E-Print Network [OSTI]

This paper describes the Power Demand Control System installed at the Lufkin Mill of Southland Division, St. Regis Paper Company. The system is based around a microprocessor unit that automatically changes the output of the generators to maintain a...

Richter, G. H.; Keenon, D.

1979-01-01T23:59:59.000Z

95

Universal power transistor base drive control unit  

SciTech Connect (OSTI)

A saturation condition regulator system for a power transistor which achieves the regulation objectives of a Baker clamp but without dumping excess base drive current into the transistor output circuit. The base drive current of the transistor is sensed and used through an active feedback circuit to produce an error signal which modulates the base drive current through a linearly operating FET. The collector base voltage of the power transistor is independently monitored to develop a second error signal which is also used to regulate base drive current. The current-sensitive circuit operates as a limiter. In addition, a fail-safe timing circuit is disclosed which automatically resets to a turn OFF condition in the event the transistor does not turn ON within a predetermined time after the input signal transition.

Gale, Allan R. (Allen Park, MI); Gritter, David J. (Racine, WI)

1988-01-01T23:59:59.000Z

96

Operational benefits of relaxed axial power distribution control limits  

SciTech Connect (OSTI)

Constant axial offset control (CAOC) was developed in the early 1970s in response to lower loss-of-coolant accident-based peaking factor limits. Th CAOC requires control of the axial power distribution within a specified band, typically +/- 5% or +3, -12% axial flux difference (AFD), about a measured target value of AFD. Operational outside of the CAOC limits results in the accumulation of penalty time. One hour of penalty time in any 24-h period is permitted. Although CAOC is sufficient to ensure peaking factor limits are satisfied, operation outside of CAOC limits is beneficial under certain conditions. Allowing a relaxation in CAOC restrictions can be used both to enhance the load follow capability of the plant by allowing control strategies that minimize the boron system duty or increase the return to power capability and to greatly increase the ability to return to power after a plant trip or shutdown. To achieve these benefits, relaxed axial offset control (RAOC) was developed. Other benefits of RAOC include a simplified technical specification and the ability to perform in-core/ex-core calibrations at higher powers. Duke Power Company has benefited in many of these ways by changing from CAOC power distribution limits to RAOC power distribution limits at the McGuire Nuclear Station. One of the chief benefits has been the ability to achieve full power much more quickly following shutdowns of short duration and reactor trips during the last half of the cycle lifetime.

Kitlan, M.S. Jr.; Miller, R.W.

1987-01-01T23:59:59.000Z

97

Power Control for Discrete-Input Block-Fading Channels  

E-Print Network [OSTI]

. K. Rasmussen CUED / F-INFENG / TR 582 August 2007 #12;#12;1 Power Control for Discrete-Input Block-Fading Channels Khoa D. Nguyen, Albert Guill´en i F`abregas and Lars K. Rasmussen Abstract We consider power systems employing orthogonal frequency division multiplexing. K. D. Nguyen and L. K. Rasmussen

Guillén i Fàbregas, Albert

98

Ris-R-1118(EN) Power Control for Wind Tur-  

E-Print Network [OSTI]

to increase the wind energy penetration. The main options are to combine wind power with a pumped hydro power been developed to assess that. The economic investigations have shown that for small systems where only small amounts of wind energy would otherwise have been dumped add-on PQ- controllers with battery

99

Solid state power bus controllers for aerospace applications  

E-Print Network [OSTI]

SOLID STATE POWER BUS CONTROLLERS FOR AEROSPACE APPLICATIONS A Thesis by TERRY JOSEPH VILLARREAL Submitted to the Office of Graduate Studies of Texas A&M University in partial fulfillment of the requirement for the degree of MASTER... OF SCIENCE December 1988 Major Subject: Electrical Eny'neering SOLID STATE POWER BUS CONTROLLERS FOR AEROSPACE APPLICATIONS A Thesis TERRY JOSEPH VILLARREAL Approved as to style and content by: Mehrdad Ehsani (Chairman of Committee) Robert D. Nevels...

Villarreal, Terry Joseph

1988-01-01T23:59:59.000Z

100

Electrical power distribution control methods, electrical energy demand monitoring methods, and power management devices  

DOE Patents [OSTI]

Electrical power distribution control methods, electrical energy demand monitoring methods, and power management devices are described. In one aspect, an electrical power distribution control method includes providing electrical energy from an electrical power distribution system, applying the electrical energy to a load, providing a plurality of different values for a threshold at a plurality of moments in time and corresponding to an electrical characteristic of the electrical energy, and adjusting an amount of the electrical energy applied to the load responsive to an electrical characteristic of the electrical energy triggering one of the values of the threshold at the respective moment in time.

Chassin, David P. (Pasco, WA); Donnelly, Matthew K. (Kennewick, WA); Dagle, Jeffery E. (Richland, WA)

2011-12-06T23:59:59.000Z

Note: This page contains sample records for the topic "rectifier power control" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


101

Electrical power distribution control methods, electrical energy demand monitoring methods, and power management devices  

DOE Patents [OSTI]

Electrical power distribution control methods, electrical energy demand monitoring methods, and power management devices are described. In one aspect, an electrical power distribution control method includes providing electrical energy from an electrical power distribution system, applying the electrical energy to a load, providing a plurality of different values for a threshold at a plurality of moments in time and corresponding to an electrical characteristic of the electrical energy, and adjusting an amount of the electrical energy applied to the load responsive to an electrical characteristic of the electrical energy triggering one of the values of the threshold at the respective moment in time.

Chassin, David P. (Pasco, WA); Donnelly, Matthew K. (Kennewick, WA); Dagle, Jeffery E. (Richland, WA)

2006-12-12T23:59:59.000Z

102

Upgrading the TFTR Transrex Power Supplies  

SciTech Connect (OSTI)

In order to provide improved and expanded experimental capabilities, the existing Transrex power supplies at PPPL are to be upgraded and modernized. Each of the 39 power supplies consists of two six pulse silicon controlled rectifier sections forming a twelve pulse power supply. The first modification is to split each supply into two independent six pulse supplies by replacing the existing obsolete twelve pulse firing generator with two commercially available six pulse firing generators. The second change replaces the existing control link with a faster system, with greater capacity, which will allow for independent control of all 78 power supply sections. The third change replaces the existing Computer Automated Measurement and Control (CAMAC) based fault detector with an Experimental Physics and Industrial Control System (EPICS) compatible unit, eliminating the obsolete CAMAC modules. Finally the remaining relay logic and interfaces to the "Hardwired Control System" will be replaces with a Programmable Logic Controller (PLC).

J. E. Lawson, R. Marsala, S. Ramakrishnan, X. Zhao, P. Sichta

2009-05-29T23:59:59.000Z

103

Model Predictive Control of Integrated Gasification Combined Cycle Power Plants  

SciTech Connect (OSTI)

The primary project objectives were to understand how the process design of an integrated gasification combined cycle (IGCC) power plant affects the dynamic operability and controllability of the process. Steady-state and dynamic simulation models were developed to predict the process behavior during typical transients that occur in plant operation. Advanced control strategies were developed to improve the ability of the process to follow changes in the power load demand, and to improve performance during transitions between power levels. Another objective of the proposed work was to educate graduate and undergraduate students in the application of process systems and control to coal technology. Educational materials were developed for use in engineering courses to further broaden this exposure to many students. ASPENTECH software was used to perform steady-state and dynamic simulations of an IGCC power plant. Linear systems analysis techniques were used to assess the steady-state and dynamic operability of the power plant under various plant operating conditions. Model predictive control (MPC) strategies were developed to improve the dynamic operation of the power plants. MATLAB and SIMULINK software were used for systems analysis and control system design, and the SIMULINK functionality in ASPEN DYNAMICS was used to test the control strategies on the simulated process. Project funds were used to support a Ph.D. student to receive education and training in coal technology and the application of modeling and simulation techniques.

B. Wayne Bequette; Priyadarshi Mahapatra

2010-08-31T23:59:59.000Z

104

PAPER ACCEPTED TO IEEE TRANSACTIONS ON POWER SYSTEMS, Nov. 2008 1 Reactive Power and Voltage Control in Distribution  

E-Print Network [OSTI]

PAPER ACCEPTED TO IEEE TRANSACTIONS ON POWER SYSTEMS, Nov. 2008 1 Reactive Power and Voltage) problem associated with reactive power and voltage control in distribution systems to minimize daily--Distribution systems, reactive power control, voltage control, optimal switching operations, mixed integer nonlinear

Cañizares, Claudio A.

105

Sandia National Laboratories: power flow control system  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr MayAtmosphericNuclear Security Administration the1developmentturbine bladelifetime ismobileparallelplantplasmapolymerpower flow control

106

Local Control of Reactive Power by Distributed Photovoltaic Generators  

E-Print Network [OSTI]

High penetration levels of distributed photovoltaic (PV) generation on an electrical distribution circuit may severely degrade power quality due to voltage sags and swells caused by rapidly varying PV generation during cloud transients coupled with the slow response of existing utility compensation and regulation equipment. Although not permitted under current standards for interconnection of distributed generation, fast-reacting, VAR-capable PV inverters may provide the necessary reactive power injection or consumption to maintain voltage regulation under difficult transient conditions. As side benefit, the control of reactive power injection at each PV inverter provides an opportunity and a new tool for distribution utilities to optimize the performance of distribution circuits, e.g. by minimizing thermal losses. We suggest a local control scheme that dispatches reactive power from each PV inverter based on local instantaneous measurements of the real and reactive components of the consumed power and the re...

Turitsyn, Konstantin S; Backhaus, Scott; Chertkov, Misha

2010-01-01T23:59:59.000Z

107

Maximum power tracking control scheme for wind generator systems  

E-Print Network [OSTI]

The purpose of this work is to develop a maximum power tracking control strategy for variable speed wind turbine systems. Modern wind turbine control systems are slow, and they depend on the design parameters of the turbine and use wind and/or rotor...

Mena Lopez, Hugo Eduardo

2008-10-10T23:59:59.000Z

108

Maximum power tracking control scheme for wind generator systems  

E-Print Network [OSTI]

The purpose of this work is to develop a maximum power tracking control strategy for variable speed wind turbine systems. Modern wind turbine control systems are slow, and they depend on the design parameters of the turbine and use wind and/or rotor...

Mena, Hugo Eduardo

2009-05-15T23:59:59.000Z

109

Green Scheduling: Scheduling of Control Systems for Peak Power Reduction  

E-Print Network [OSTI]

approach to fine-grained coordination of energy demand by scheduling energy consuming control systems of the system variables only, control system execution (i.e. when energy is supplied to the system-Scheduling; Energy Systems; Peak Power Reduction; Load Balancing; I. INTRODUCTION During a major sporting event

Pappas, George J.

110

Controllers with Minimal Observation Power (Application to Timed Systems)  

E-Print Network [OSTI]

Controllers with Minimal Observation Power (Application to Timed Systems) Peter Bulychev1 , Franck is the computation of a subset of predicates sufficient for control and whose cost is minimal. Our solution avoids, Danish-Chinese Center for Cyber Physical Systems (IDEA4CPS) and VKR Center of Excellence MT-LAB. #12;The

David, Alexandre

111

Power Quality/Harmonic Detection: Harmonic Control in Electric Power Systems for the Telecommunications Industry  

E-Print Network [OSTI]

The control of harmonics in power systems continues to be a major concern in the telecommunications industry. AC/DC telecommunication conversion equipment has rarely been thought of as playing a major role in the harmonic interaction problem. Yet...

Felkner, L. J.; Waggoner, R. M.

112

Power control system for a hot gas engine  

DOE Patents [OSTI]

A power control system for a hot gas engine of the type in which the power output is controlled by varying the mean pressure of the working gas charge in the engine has according to the present invention been provided with two working gas reservoirs at substantially different pressure levels. At working gas pressures below the lower of said levels the high pressure gas reservoir is cut out from the control system, and at higher pressures the low pressure gas reservoir is cut out from the system, thereby enabling a single one-stage compressor to handle gas within a wide pressure range at a low compression ratio.

Berntell, John O. (Staffanstorp, SE)

1986-01-01T23:59:59.000Z

113

Hardwired Control Changes For NSTX DC Power Feeds  

SciTech Connect (OSTI)

The National Spherical Torus Experiment (NSTX) has been designed and installed in the existing facilities at Princeton Plasma Physics Laboratory (PPPL). Most of the hardware, plant facilities, auxiliary sub-systems, and power systems originally used for the Tokamak Fusion Test Reactor (TFTR) have been used with suitable modifications to reflect NSTX needs. The original TFTR Hardwired Control System (HCS) with electromechanical relays was used for NSTX DC Power loop control and protection during NSTX operations. As part of the NSTX Upgrade, the HCS is being changed to a PLC-based system with the same control logic. This paper gives a description of the changeover to the new PLC-based system __________________________________________________

Ramakrishnan, S.

2013-06-28T23:59:59.000Z

114

Local control of reactive power by distributed photovoltaic generators  

SciTech Connect (OSTI)

High penetration levels of distributed photovoltaic (PV) generation on an electrical distribution circuit may severely degrade power quality due to voltage sags and swells caused by rapidly varying PV generation during cloud transients coupled with the slow response of existing utility compensation and regulation equipment. Although not permitted under current standards for interconnection of distributed generation, fast-reacting, VAR-capable PV inverters may provide the necessary reactive power injection or consumption to maintain voltage regulation under difficult transient conditions. As side benefit, the control of reactive power injection at each PV inverter provides an opportunity and a new tool for distribution utilities to optimize the performance of distribution circuits, e.g. by minimizing thermal losses. We suggest a local control scheme that dispatches reactive power from each PV inverter based on local instantaneous measurements of the real and reactive components of the consumed power and the real power generated by the PVs. Using one adjustable parameter per circuit, we balance the requirements on power quality and desire to minimize thermal losses. Numerical analysis of two exemplary systems, with comparable total PV generation albeit a different spatial distribution, show how to adjust the optimization parameter depending on the goal. Overall, this local scheme shows excellent performance; it's capable of guaranteeing acceptable power quality and achieving significant saving in thermal losses in various situations even when the renewable generation in excess of the circuit own load, i.e. feeding power back to the higher-level system.

Chertkov, Michael [Los Alamos National Laboratory; Turitsyn, Konstantin [Los Alamos National Laboratory; Sulc, Petr [Los Alamos National Laboratory; Backhaus, Scott [Los Alamos National Laboratory

2010-01-01T23:59:59.000Z

115

Power and Frequency Control as it Relates to Wind-Powered Generation  

SciTech Connect (OSTI)

This report is a part of an investigation of the ability of the U.S. power system to accommodate large scale additions of wind generation. The objectives of this report are to describe principles by which large multi-area power systems are controlled and to anticipate how the introduction of large amounts of wind power production might require control protocols to be changed. The operation of a power system is described in terms of primary and secondary control actions. Primary control is fast, autonomous, and provides the first-line corrective action in disturbances; secondary control takes place on a follow-up time scale and manages the deployment of resources to ensure reliable and economic operation. This report anticipates that the present fundamental primary and secondary control protocols will be satisfactory as wind power provides an increasing fraction of the total production, provided that appropriate attention is paid to the timing of primary control response, to short term wind forecasting, and to management of reserves for control action.

Lacommare, Kristina S H

2010-12-20T23:59:59.000Z

116

Photovoltaic Powering And Control System For Electrochromic Windows  

DOE Patents [OSTI]

A sealed insulated glass unit is provided with an electrochromic device for modulating light passing through the unit. The electrochromic device is controlled from outside the unit by a remote control electrically unconnected to the device. Circuitry within the unit may be magnetically controlled from outside. The electrochromic device is powered by a photovoltaic cells. The photovoltaic cells may be positioned so that at least a part of the light incident on the cell passes through the electrochromic device, providing a form of feedback control. A variable resistance placed in parallel with the electrochromic element is used to control the response of the electrochromic element to changes in output of the photovoltaic cell.

Schulz, Stephen C. (Tewksbury, MA); Michalski, Lech A. (Pennington, NJ); Volltrauer, Hermann N. (Englishtown, NJ); Van Dine, John E. (Faribault, MN)

2000-04-25T23:59:59.000Z

117

Options for Control of Reactive Power by Distributed Photovoltaic Generators  

E-Print Network [OSTI]

High penetration levels of distributed photovoltaic(PV) generation on an electrical distribution circuit present several challenges and opportunities for distribution utilities. Rapidly varying irradiance conditions may cause voltage sags and swells that cannot be compensated by slowly responding utility equipment resulting in a degradation of power quality. Although not permitted under current standards for interconnection of distributed generation, fast-reacting, VAR-capable PV inverters may provide the necessary reactive power injection or consumption to maintain voltage regulation under difficult transient conditions. As side benefit, the control of reactive power injection at each PV inverter provides an opportunity and a new tool for distribution utilities to optimize the performance of distribution circuits, e.g. by minimizing thermal losses. We discuss and compare via simulation various design options for control systems to manage the reactive power generated by these inverters. An important design decision that weighs on the speed and quality of communication required is whether the control should be centralized or distributed (i.e. local). In general, we find that local control schemes are capable for maintaining voltage within acceptable bounds. We consider the benefits of choosing different local variables on which to control and how the control system can be continuously tuned between robust voltage control, suitable for daytime operation when circuit conditions can change rapidly, and loss minimization better suited for nighttime operation.

Petr Sulc; Konstantin Turitsyn; Scott Backhaus; Michael Chertkov

2010-08-04T23:59:59.000Z

118

Power Generating Stationary Engines Nox Control: A Closed Loop Control  

Office of Energy Efficiency and Renewable Energy (EERE) Indexed Site

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE: Alternative Fuels Data Center Home Page on Google Bookmark EERE: Alternative Fuels Data Center Home Page on Delicious RankCombustion | Department ofT ib l L d FNEPA/309 Reviewers | DepartmentSiteMaryland |2POWER ELECTRONICS

119

E-Print Network 3.0 - activating delayed rectifier Sample Search...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Summary: itself. The concept of active damping for the current-source rectifier is not new. However, most research... of 3.65-6.09 pu. Active damping uses the rectifier to...

120

Options for Control of Reactive Power by Distributed Photovoltaic Generators  

E-Print Network [OSTI]

High penetration levels of distributed photovoltaic(PV) generation on an electrical distribution circuit present several challenges and opportunities for distribution utilities. Rapidly varying irradiance conditions may cause voltage sags and swells that cannot be compensated by slowly responding utility equipment resulting in a degradation of power quality. Although not permitted under current standards for interconnection of distributed generation, fast-reacting, VAR-capable PV inverters may provide the necessary reactive power injection or consumption to maintain voltage regulation under difficult transient conditions. As side benefit, the control of reactive power injection at each PV inverter provides an opportunity and a new tool for distribution utilities to optimize the performance of distribution circuits, e.g. by minimizing thermal losses. We discuss and compare via simulation various design options for control systems to manage the reactive power generated by these inverters. An important design de...

Sulc, Petr; Backhaus, Scott; Chertkov, Michael

2010-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "rectifier power control" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


121

A holistic investigation of complexity sources in nuclear power plant control rooms  

E-Print Network [OSTI]

The nuclear power community in the United States is moving to modernize aging power plant control rooms as well as develop control rooms for new reactors. New generation control rooms, along with modernized control rooms, ...

Sasangohar, Farzan

2011-01-01T23:59:59.000Z

122

Control and Optimization Meet the Smart Power Grid - Scheduling of Power Demands for Optimal Energy Management  

E-Print Network [OSTI]

The smart power grid aims at harnessing information and communication technologies to enhance reliability and enforce sensible use of energy. Its realization is geared by the fundamental goal of effective management of demand load. In this work, we envision a scenario with real-time communication between the operator and consumers. The grid operator controller receives requests for power demands from consumers, with different power requirement, duration, and a deadline by which it is to be completed. The objective is to devise a power demand task scheduling policy that minimizes the grid operational cost over a time horizon. The operational cost is a convex function of instantaneous power consumption and reflects the fact that each additional unit of power needed to serve demands is more expensive as demand load increases.First, we study the off-line demand scheduling problem, where parameters are fixed and known. Next, we devise a stochastic model for the case when demands are generated continually and sched...

Koutsopoulos, Iordanis

2010-01-01T23:59:59.000Z

123

Enhanced IGCC regulatory control and coordinated plant-wide control strategies for improving power ramp rates  

SciTech Connect (OSTI)

As part of ongoing R&D activities at the National Energy Technology Laboratory’s (NETL) Advanced Virtual Energy Simulation Training & Research (AVESTAR™) Center, this paper highlights strategies for enhancing low-level regulatory control and system-wide coordinated control strategies implemented in a high-fidelity dynamic simulator for an Integrated Gasification Combined Cycle (IGCC) power plant with carbon capture. The underlying IGCC plant dynamic model contains 20 major process areas, each of which is tightly integrated with the rest of the power plant, making individual functionally-independent processes prone to routine disturbances. Single-loop feedback control although adequate to meet the primary control objective for most processes, does not take into account in advance the effect of these disturbances, making the entire power plant undergo large offshoots and/or oscillations before the feedback action has an opportunity to impact control performance. In this paper, controller enhancements ranging from retuning feedback control loops, multiplicative feed-forward control and other control techniques such as split-range control, feedback trim and dynamic compensation, applicable on various subsections of the integrated IGCC plant, have been highlighted and improvements in control responses have been given. Compared to using classical feedback-based control structure, the enhanced IGCC regulatory control architecture reduces plant settling time and peak offshoots, achieves faster disturbance rejection, and promotes higher power ramp-rates. In addition, improvements in IGCC coordinated plant-wide control strategies for “Gasifier-Lead”, “GT-Lead” and “Plantwide” operation modes have been proposed and their responses compared. The paper is concluded with a brief discussion on the potential IGCC controller improvements resulting from using advanced process control, including model predictive control (MPC), as a supervisory control layer.

Mahapatra, P.; Zitney, S.

2012-01-01T23:59:59.000Z

124

Boron control system for a nuclear power plant  

SciTech Connect (OSTI)

Ion exchangers which reversibly store borate ions in a temperature dependent process are combined with evaporative boric acid recovery apparatus to provide a boron control system for controlling the reactivity of nuclear power plants. A plurality of ion exchangers are operated sequentially to provide varying amounts of boric acid to a nuclear reactor for load follow operations. Evaporative boric acid recovery apparatus is utilized for major changes in the boron concentration within the nuclear reactor.

Brown, W.W.; Van der Schoot, M.R.

1980-09-30T23:59:59.000Z

125

Communications and control for electric power systems: Final report  

SciTech Connect (OSTI)

This report is a summary of some of the work done on the Communications and Control project, with particular emphasis on the achievements during the years 1986--1996. During those years, the project moved away from concern with dispersed storage and generation and its impact on power system operation (the team was responsible for studies in this area, and for making a power system simulator that included DSG), and became involved in more concrete work aimed at applying high-tech solutions to problems of power system communications and control. This report covers work done at JPL on the following topics: (1) the measurement of electric and magnetic fields, both ac and dc; (2) the use of optical power to supply low-power electronics; (3) the design of a fault-tolerant communication system designed for distribution automation; and (4) a digital phase locked loop that allows the use of low-power transmitting electronics to recreate a good-quality signal at the receiver. In a report of this kind, only the results and highlights of the work are described.

Kirkham, H.

1998-04-01T23:59:59.000Z

126

Control of fuel cell power output Federico Zenith, Sigurd Skogestad *  

E-Print Network [OSTI]

Control of fuel cell power output Federico Zenith, Sigurd Skogestad * Department of Chemical A simplified dynamic model for fuel cells is developed, based on the concept of instantaneous characteristic, which is the set of values of current and voltage that a fuel cell can reach instantaneously

Skogestad, Sigurd

127

INTRODUCTION In order to allow intelligent power control and  

E-Print Network [OSTI]

requirements in smart grid by secur- ing the information on single customer data, incentive plans, and other of Attribute Based Encryption (ABE) for smart grid communication scenarios. In particular, we focusINTRODUCTION In order to allow intelligent power control and monitoring, the concept of smart grid

Shen, Xuemin "Sherman"

128

Soft-stall control versus furling control for small wind turbine power regulation  

SciTech Connect (OSTI)

Many small wind turbines are designed to furl (turn) in high winds to regulate power and provide overspeed protection. Furling control results in poor energy capture at high wind speeds. This paper proposes an alternative control strategy for small wind turbines -- the soft-stall control method. The furling and soft-stall control strategies are compared using steady state analysis and dynamic simulation analysis. The soft-stall method is found to offer several advantages: increased energy production at high wind speeds, energy production which tracks the maximum power coefficient at low to medium wind speeds, reducing furling noise, and reduced thrust.

Muljadi, E.; Forsyth, T.; Butterfield, C.P.

1998-07-01T23:59:59.000Z

129

Load frequency control of interconnected power systems with system constraints  

E-Print Network [OSTI]

Responses D. Generating Unit Characteristics E. The State Variable Representation of the Dynamic F. LFC System Data . 1. Power System Data 2. Controller Gains 3. The Reheat-turbine Prime-Mover Data Model . 6 7 8 10 11 12 15 15 18 23 23 25... 56 25 LFC system response with VSS control. Area 1 fails to respond for a load change of APnr ? 0, 01 p. u. 57 26 LFC system response with conventional controL Area 1 fails to respond for the same load disturbance as in Fig. 26. . . 58 27...

Choudhury, Md Ershadul H

1993-01-01T23:59:59.000Z

130

Energy efficient control for power management circuits operating from nano-watts to watts  

E-Print Network [OSTI]

Energy efficiency and form factor are the key driving forces in today's power electronics. All power delivery circuits, irrespective of the magnitude of power, basically consists of power trains, gate drivers and control ...

Bandyopadhyay, Saurav

2013-01-01T23:59:59.000Z

131

Mercury control for coal-fired power plants  

SciTech Connect (OSTI)

On 15 March 2005 the US Environmental Protection Agency issued its Clean Air Mercury Rule (CAMP) to regulate mercury emissions from coal-fired power plants. EPRI is working with the US Department of Energy and the power industry to develop mercury control technologies needed to meet the final 2018 emission limits. Some improvements can be made by modifying existing SO{sub 2} or NOx control devices. Precombustion cleaning reduces mercury content of eastern coals by about one third. Adding a little halogen is another technology being researched - this promotes oxidation improving short-term mercury capture. EPRI is developing the TOXECON{trademark} technology to address a major problem of using sorbents to control mercury emissions: contamination of fly ash. 5 figs.

Haase, P.

2005-06-30T23:59:59.000Z

132

Control system and method for a universal power conditioning system  

SciTech Connect (OSTI)

A new current loop control system method is proposed for a single-phase grid-tie power conditioning system that can be used under a standalone or a grid-tie mode. This type of inverter utilizes an inductor-capacitor-inductor (LCL) filter as the interface in between inverter and the utility grid. The first set of inductor-capacitor (LC) can be used in the standalone mode, and the complete LCL can be used for the grid-tie mode. A new admittance compensation technique is proposed for the controller design to avoid low stability margin while maintaining sufficient gain at the fundamental frequency. The proposed current loop controller system and admittance compensation technique have been simulated and tested. Simulation results indicate that without the admittance path compensation, the current loop controller output duty cycle is largely offset by an undesired admittance path. At the initial simulation cycle, the power flow may be erratically fed back to the inverter causing catastrophic failure. With admittance path compensation, the output power shows a steady-state offset that matches the design value. Experimental results show that the inverter is capable of both a standalone and a grid-tie connection mode using the LCL filter configuration.

Lai, Jih-Sheng; Park, Sung Yeul; Chen, Chien-Liang

2014-09-02T23:59:59.000Z

133

Advanced underground Vehicle Power and Control: The locomotive Research Platform  

SciTech Connect (OSTI)

Develop a fuelcell mine locomotive with metal-hydride hydrogen storage. Test the locomotive for fundamental limitations preventing successful commercialization of hydride fuelcells in underground mining. During Phase 1 of the DOE-EERE sponsored project, FPI and its partner SNL, completed work on the development of a 14.4 kW fuelcell power plant and metal-hydride energy storage. An existing battery-electric locomotive with similar power requirements, minus the battery module, was used as the base vehicle. In March 2001, Atlas Copco Wagner of Portland, OR, installed the fuelcell power plant into the base vehicle and initiated integration of the system into the vehicle. The entire vehicle returned to Sandia in May 2001 for further development and integration. Initial system power-up took place in December 2001. A revision to the original contract, Phase 2, at the request of DOE Golden Field Office, established Vehicle Projects LLC as the new prime contractor,. Phase 2 allowed industry partners to conduct surface tests, incorporate enhancements to the original design by SNL, perform an extensive risk and safety analysis, and test the fuelcell locomotive underground under representative production mine conditions. During the surface tests one of the fuelcell stacks exhibited reduced power output resulting in having to replace both fuelcell stacks. The new stacks were manufactured with new and improved technology resulting in an increase of the gross power output from 14.4 kW to 17 kW. Further work by CANMET and Hatch Associates, an engineering consulting firm specializing in safety analysis for the mining industry, both under subcontract to Vehicle Projects LLC, established minimum requirements for underground testing. CANMET upgraded the Programmable Logic Control (PLC) software used to monitor and control the fuelcell power plant, taking into account locomotive operator's needs. Battery Electric, a South Africa manufacturer, designed and manufactured (at no cost to the project) a new motor controller capable of operating the higher rpm motor and different power characteristics of the fuelcells. In early August 2002, CANMET, with the technical assistance of Nuvera Fuel Cells and Battery Electric, installed the new PLC software, installed the new motor controller, and installed the new fuelcell stacks. After minor adjustments, the fuelcell locomotive pulled its first fully loaded ore cars on a surface track. The fuelcell-powered locomotive easily matched the battery powered equivalent in its ability to pull tonnage and equaled the battery-powered locomotive in acceleration. The final task of Phase 2, testing the locomotive underground in a production environment, occurred in early October 2002 in a gold mine. All regulatory requirements to allow the locomotive underground were completed and signed off by Hatch Associates prior to going underground. During the production tests, the locomotive performed flawlessly with no failures or downtime. The actual tests occurred during a 2-week period and involved moving both gold ore and waste rock over a 1,000 meter track. Refueling, or recharging, of the metal-hydride storage took place on the surface. After each shift, the metal-hydride storage module was removed from the locomotive, transported to surface, and filled with hydrogen from high-pressure tanks. The beginning of each shift started with taking the fully recharged metal-hydride storage module down into the mine and re-installing it onto the locomotive. Each 8 hour shift consumed approximately one half to two thirds of the onboard hydrogen. This indicates that the fuelcell-powered locomotive can work longer than a similar battery-powered locomotive, which operates about 6 hours, before needing a recharge.

Vehicle Projects LLC

2003-01-28T23:59:59.000Z

134

Soft-Stall Control versus Furling Control for Small Wind Turbine Power Regulation  

SciTech Connect (OSTI)

Many small wind turbines are designed to furl (turn) in high winds to regulate power and provide overspeed protection. Furling control results in poor energy capture at high wind speeds. This paper proposes an alternative control strategy for small wind turbines -- the soft-stall method. The furling and soft-stall control strategies are compared using steady state analysis and dynamic simulation analysis. The soft-stall method is found to offer several advantages: increased energy production at high wind speeds, energy production which tracks the maximum power coefficient at low to medium wind speeds, reduced furling noise, and reduced thrust.

Muljadi, E.; Forsyth, T.; Butterfield, C. P.

1998-07-01T23:59:59.000Z

135

Introduction What is power electronics?  

E-Print Network [OSTI]

: single/multi-phase, full/half-bridge Applications: renewable energy, UPS, electric vehicles, HVDC. AC Rectifiers: single/multi-phase, full/half-bridge Applications: all grid powered electronic devices, HVDC. AC

Knobloch,JĂĽrgen

136

Development of model reference adaptive control theory for electric power plant control applications  

SciTech Connect (OSTI)

The scope of this effort includes the theoretical development of a multi-input, multi-output (MIMO) Model Reference Control (MRC) algorithm, (i.e., model following control law), Model Reference Adaptive Control (MRAC) algorithm and the formulation of a nonlinear model of a typical electric power plant. Previous single-input, single-output MRAC algorithm designs have been generalized to MIMO MRAC designs using the MIMO MRC algorithm. This MRC algorithm, which has been developed using Command Generator Tracker methodologies, represents the steady state behavior (in the adaptive sense) of the MRAC algorithm. The MRC algorithm is a fundamental component in the MRAC design and stability analysis. An enhanced MRC algorithm, which has been developed for systems with more controls than regulated outputs, alleviates the MRC stability constraint of stable plant transmission zeroes. The nonlinear power plant model is based on the Cromby model with the addition of a governor valve management algorithm, turbine dynamics and turbine interactions with extraction flows. An application of the MRC algorithm to a linearization of this model demonstrates its applicability to power plant systems. In particular, the generated power changes at 7% per minute while throttle pressure and temperature, reheat temperature and drum level are held constant with a reasonable level of control. The enhanced algorithm reduces significantly control fluctuations without modifying the output response.

Mabius, L.E.

1982-09-15T23:59:59.000Z

137

Simulation-based biagnostics and control for nuclar power plants  

SciTech Connect (OSTI)

Advanced simulation-based diagnostics and control guidance systems for the identification and management of off-normal transient events in nuclear power plants is currently under investigation. To date a great deal of progress has been made in effectively and efficiently combining information obtained through fuzzy pattern recognition and macroscopic mass and energy inventory analysis for use in multiple failure diagnostics. Work has also begun on the unique problem of diagnostics and surveillance methodologies for advanced passively-safe reactors systems utilizing both statistical and fuzzy information. Plans are also being formulated for the development of deterministic optimal control algorithms combined with Monte Carlo incremental learning algorithms to be used for the flexible and efficient control of reactor transients.

Lee, J.C.

1993-01-01T23:59:59.000Z

138

Combining Droop Curve Concepts with Control Systems for Wind Turbine Active Power Control: Preprint  

SciTech Connect (OSTI)

Wind energy is becoming a larger portion of the global energy portfolio and wind penetration has increased dramatically in certain regions of the world. This increasing wind penetration has driven the need for wind turbines to provide active power control (APC) services to the local utility grid, as wind turbines do not intrinsically provide frequency regulation services that are common with traditional generators. It is common for large scale wind turbines to be decoupled from the utility grid via power electronics, which allows the turbine to synthesize APC commands via control of the generator torque and blade pitch commands. Consequently, the APC services provided by a wind turbine can be more flexible than those provided by conventional generators. This paper focuses on the development and implementation of both static and dynamic droop curves to measure grid frequency and output delta power reference signals to a novel power set point tracking control system. The combined droop curve and power tracking controller is simulated and comparisons are made between simulations using various droop curve parameters and stochastic wind conditions. The tradeoffs involved with aggressive response to frequency events are analyzed. At the turbine level, simulations are performed to analyze induced structural loads. At the grid level, simulations test a wind plant's response to a dip in grid frequency.

Buckspan, A.; Aho, J.; Pao, L.; Fleming, P.; Jeong, Y.

2012-06-01T23:59:59.000Z

139

Electric Power Research Institute: Environmental Control Technology Center.  

SciTech Connect (OSTI)

Operations and maintenance continued this month at the Electric Power Research Institute`s (EPRI`s) Environmental Control Technology Center (ECTC). Testing for the month involved the Dry Sorbent Injection (DST) test block with the Carbon Injection System. The 1.0 MW Cold-Side Selective Catalytic Reduction (SCR) unit, the 0.4 MW Mini-Pilot Wet Scrubber, and the 4.0 MW Pilot Wet Scrubber remained idle this month in a cold-standby mode and were inspected regularly. These units remain available for testing as future project work is identified. The 1990 Clean Air Act Amendments have required that the Environmental Protection Agency (EPA) assess the health risks and environmental effects associated with air toxic emissions (primarily mercury) from fossil-fuel fired utility boilers. EPRI has sponsored research on environmental mercury since 1983 to determine the factors that may influence human health, and to determine the role of electric power generating stations in contributing to those factors. Over the last four years, EPRI`s Environmental Control Technology Center (ECTC) has conducted EPRI and DOE sponsored testing to develop and demonstrate appropriate measurement methods and control technologies for power plant atmospheric mercury emissions. Building upon the experience and expertise of the EPRI ECTC, a test program was initiated at the Center in July to further evaluate dry sorbent-based injection technologies upstream of a cold-side ESP for mercury control, and to determine the effects of such sorbents on ESP performance. The results from this program will be compared to the results from previous DOE/EPRI demonstrations, and to other ongoing programs. The primary objectives of this test program are to: (1) Determine the levels of mercury removal achievable by dry sorbent injection upstream of an electrostatic precipitator (ESP). The process parameters to be investigated include sorbent residence time, sorbent type, sorbent size, sorbent loading, and flue gas temperature. (2) Determine the impact of sorbent injection on ESP performance.

NONE

1997-07-01T23:59:59.000Z

140

E-beam high voltage switching power supply  

DOE Patents [OSTI]

A high-power power supply produces a controllable, constant high voltage put under varying and arcing loads. The power supply includes a voltage regulator, an inductor, an inverter for producing a high frequency square wave current of alternating polarity, an improved inverter voltage clamping circuit, a step up transformer, an output rectifier for producing a dc voltage at the output of each module, and a current sensor for sensing output current. The power supply also provides dynamic response to varying loads by controlling the voltage regulator duty cycle and circuitry is provided for sensing incipient arc currents at the output of the power supply to simultaneously decouple the power supply circuitry from the arcing load. The power supply includes a plurality of discrete switching type dc--dc converter modules.

Shimer, Daniel W. (Danville, CA); Lange, Arnold C. (Livermore, CA)

1996-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "rectifier power control" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


141

E-beam high voltage switching power supply  

DOE Patents [OSTI]

A high-power power supply produces a controllable, constant high voltage output under varying and arcing loads. The power supply includes a voltage regulator, an inductor, an inverter for producing a high frequency square wave current of alternating polarity, an improved inverter voltage clamping circuit, a step up transformer, an output rectifier for producing a dc voltage at the output of each module, and a current sensor for sensing output current. The power supply also provides dynamic response to varying loads by controlling the voltage regulator duty cycle and circuitry is provided for sensing incipient arc currents at the output of the power supply to simultaneously decouple the power supply circuitry from the arcing load. The power supply includes a plurality of discrete switching type dc--dc converter modules. 5 figs.

Shimer, D.W.; Lange, A.C.

1996-10-15T23:59:59.000Z

142

Switching power supply  

DOE Patents [OSTI]

The invention is a repratable capacitor charging, switching power supply. A ferrite transformer steps up a dc input. The transformer primary is in a full bridge configuration utilizing power MOSFETs as the bridge switches. The transformer secondary is fed into a high voltage, full wave rectifier whose output is connected directly to the energy storage capacitor. The transformer is designed to provide adequate leakage inductance to limit capacitor current. The MOSFETs are switched to the variable frequency from 20 to 50 kHz to charge a capacitor from 0.6 kV. The peak current in a transformer primary and secondary is controlled by increasing the pulse width as the capacitor charges. A digital ripple counter counts pulses and after a preselected desired number is reached an up-counter is clocked.

Mihalka, A.M.

1984-06-05T23:59:59.000Z

143

An Aircraft Electric Power Testbed for Validating Automatically Synthesized Reactive Control Protocols  

E-Print Network [OSTI]

An Aircraft Electric Power Testbed for Validating Automatically Synthesized Reactive Control reactive synthesis; testbed; aircraft electric power system 1. INTRODUCTION AND MOTIVATION Aircraft of Pennsylvania utopcu@seas.upenn.edu ABSTRACT Modern aircraft increasingly rely on electric power for sub

Xu , Huan

144

The effect of high penetration of wind power on primary frequency control of power systems.  

E-Print Network [OSTI]

??In this work, a power system with wind power units and hydro power units are considered. The hydro power unit and variable speed wind turbine… (more)

Motamed, Bardia

2013-01-01T23:59:59.000Z

145

E-Print Network 3.0 - automatic power control Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

Power Transmission, Distribution and Plants ; Engineering 7 Modeling of wind farm controllers Poul Srensen1 Summary: as the overall control on the wind farm level....

146

E-Print Network 3.0 - adaptive power control Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

controller, which does not need any... Coordinating Control of a Power System with Wind Farm Integration and Multiple FACTS Devices", Neural Networks... , "Coordinated Reactive...

147

MARTHA: Architecture for Control and Emulation of Power Electronics and Smart Grid Systems  

E-Print Network [OSTI]

conversion; (3) it allows for power flow control between an electric vehicle motor and battery; and (4 conversion technology [1] that enables efficient and fully controllable conversion of electrical power) it enables power grid dynamic stabilization. Power electronics could potentially reduce overall electricity

Devadas, Srinivas

148

WIRELESS HELIOSTAT AND CONTROL SYSTEM FOR LARGE SELF-POWERED HELIOSTAT FIELDS  

E-Print Network [OSTI]

individual heliostats, represent about 40% of the investment into the solar power plant. Furthermore systems using wireless control and self-powering with PV panels were developed, installed and tested, commercial solar power plants utilize dedicated wired links and bus systems to power and control heliostats

Turau, Volker

149

Multicore Architecture for Control and Emulation of Power Electronics and Smart Grid Systems  

E-Print Network [OSTI]

, and control subsystem on the other side. Power electronics enables power flow interface of solar photovoltaic Modeling The boost converter is a high efficiency DC/DC switching-mode power converter, with an output DCMulticore Architecture for Control and Emulation of Power Electronics and Smart Grid Systems Michel

Sanders, Seth

150

Superior Valley photovoltaic power processing and system controller evaluation  

SciTech Connect (OSTI)

Sandia National Laboratories, sponsored by the US Department of Energy`s Office of Energy Management, conducts the photovoltaic balance-of-system program. Under this program, Sandia supports the Department of Defense Strategic Environmental Research Development Plan, SERDP, which is advancing the use of photovoltaics in operational DoD facilities. This report details the acceptance testing of the first of these photovoltaic hybrid systems: the Superior Valley photovoltaic-diesel hybrid system. This is the first of several photovoltaic installations for the Department of Defense. The system hardware tested at Sandia included an inverter, maximum power trackers, and a system controller.

Bonn, R.; Ginn, J.; Zirzow, J.; Sittler, G.

1995-11-01T23:59:59.000Z

151

Reactive power control of grid-connected wind farm based on adaptive dynamic programming  

E-Print Network [OSTI]

is widely used in the wind power system for its advantages over other two types [5]. The characteristicsReactive power control of grid-connected wind farm based on adaptive dynamic programming Yufei Tang Wind farm Power system Adaptive control a b s t r a c t Optimal control of large-scale wind farm has

He, Haibo

152

Control of a Fuel-Cell Powered DC Electric Vehicle Motor  

E-Print Network [OSTI]

Control of a Fuel-Cell Powered DC Electric Vehicle Motor Federico Zenith Sigurd Skogestad of a Fuel-Cell Powered DC Electric Vehicle Motor #12;3 Currently Available Models and Control Strategies Skogestad, Control of a Fuel-Cell Powered DC Electric Vehicle Motor #12;3 Currently Available Models

Skogestad, Sigurd

153

Surveillance and Control: Legislative Power in Argentina and Brazil* Charles Pessanha**  

E-Print Network [OSTI]

1 Surveillance and Control: Legislative Power in Argentina and Brazil* Charles Pessanha and Control: Legislative Power in Argentina and Brazil "La société a le droit de demander compte à tout agent countries. Key-words: Accountability; External Control; Legislative Power; Brazil; Argentina Introduction

Paris-Sud XI, Université de

154

A nonlinear robust HVDC control for a parallel AC/DC power system  

E-Print Network [OSTI]

A nonlinear robust HVDC control for a parallel AC/DC power system Hongzhi Cai a , Zhihua Qu b. Keywords: Robust control; HVDC; Power system; Stability; Lyapunov method 1. Introduction It has been recognized that, through an HVDC transmission line, fast electronic control can be applied on the DC power

Qu, Zhihua

155

Joint Power Control and Link Scheduling in Wireless Networks for Throughput Optimization  

E-Print Network [OSTI]

Joint Power Control and Link Scheduling in Wireless Networks for Throughput Optimization Liqun Fu formulate the general joint link scheduling and power control problem as an in- teger linear programming optimality. Index Terms--scheduling, power control, SINR constraints. I. INTRODUCTION Due to their unconfined

Huang, Jianwei

156

Energy Efficient Joint Scheduling and Power Control for Wireless Sensor Networks  

E-Print Network [OSTI]

Energy Efficient Joint Scheduling and Power Control for Wireless Sensor Networks Gang Lu in TDMA link scheduling with transmission power control using a realistic SINR-based interference model. We then investigate the scheduling and power control problem with the objective of minimizing

Krishnamachari, Bhaskar

157

Joint Scheduling, Power Control and Routing in Symmetric, One-dimensional, Multi-hop Wireless Networks  

E-Print Network [OSTI]

Joint Scheduling, Power Control and Routing in Symmetric, One-dimensional, Multi-hop Wireless scheduling, routing and power control that achieves max-min fair rate allocation in a multi-hop wireless that a traditional layering network approach, separating routing, scheduling, flow and power control

Paris-Sud XI, Université de

158

Real Power and Reactive Power Control of a Three-Phase Single-Stage-PV System and PV voltage Stability  

SciTech Connect (OSTI)

Grid-connected photovoltaic (PV) systems with power electronic interfaces can provide both real and reactive power to meet power system needs with appropriate control algorithms. This paper presents the control algorithm design for a three-phase single-stage grid-connected PV inverter to achieve either maximum power point tracking (MPPT) or a certain amount of real power injection, as well as the voltage/var control. The switching between MPPT control mode and a certain amount of real power control mode is automatic and seamless. Without the DC-to-DC booster stage, PV DC voltage stability is an important issue in the control design especially when the PV inverter is operating at maximum power point (MPP) with voltage/var control. The PV DC voltage collapse phenomenon and its reason are discussed. The method based on dynamic correction of the PV inverter output is proposed to ensure PV DC voltage stability. Simulation results of the single-stage PV system during system disturbances and fast solar irradiation changes confirm that the proposed control algorithm for single-stage PV inverters can provide appropriate real and reactive power services and ensure PV DC voltage stability during dynamic system operation and atmospheric conditions.

Li, Huijuan [ORNL] [ORNL; Xu, Yan [ORNL] [ORNL; Adhikari, Sarina [ORNL] [ORNL; Rizy, D Tom [ORNL] [ORNL; Li, Fangxing [ORNL] [ORNL; Irminger, Philip [ORNL] [ORNL

2012-01-01T23:59:59.000Z

159

Tutorial of Wind Turbine Control for Supporting Grid Frequency through Active Power Control: Preprint  

SciTech Connect (OSTI)

As wind energy becomes a larger portion of the world's energy portfolio and wind turbines become larger and more expensive, wind turbine control systems play an ever more prominent role in the design and deployment of wind turbines. The goals of traditional wind turbine control systems are maximizing energy production while protecting the wind turbine components. As more wind generation is installed there is an increasing interest in wind turbines actively controlling their power output in order to meet power setpoints and to participate in frequency regulation for the utility grid. This capability will be beneficial for grid operators, as it seems possible that wind turbines can be more effective at providing some of these services than traditional power plants. Furthermore, establishing an ancillary market for such regulation can be beneficial for wind plant owner/operators and manufacturers that provide such services. In this tutorial paper we provide an overview of basic wind turbine control systems and highlight recent industry trends and research in wind turbine control systems for grid integration and frequency stability.

Aho, J.; Buckspan, A.; Laks, J.; Fleming, P.; Jeong, Y.; Dunne, F.; Churchfield, M.; Pao, L.; Johnson, K.

2012-03-01T23:59:59.000Z

160

Precision control of high temperature furnaces using an auxiliary power supply and charged practice current flow  

DOE Patents [OSTI]

Two power supplies are combined to control a furnace. A main power supply heats the furnace in the traditional manner, while the power from the auxiliary supply is introduced as a current flow through charged particles existing due to ionized gas or thermionic emission. The main power supply provides the bulk heating power and the auxiliary supply provides a precise and fast power source such that the precision of the total power delivered to the furnace is improved.

Pollock, George G. (San Ramon, CA)

1997-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "rectifier power control" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


161

Precision control of high temperature furnaces using an auxiliary power supply and charged particle current flow  

DOE Patents [OSTI]

Two power supplies are combined to control a furnace. A main power supply heats the furnace in the traditional manner, while the power from the auxiliary supply is introduced as a current flow through charged particles existing due to ionized gas or thermionic emission. The main power supply provides the bulk heating power and the auxiliary supply provides a precise and fast power source such that the precision of the total power delivered to the furnace is improved. 5 figs.

Pollock, G.G.

1997-01-28T23:59:59.000Z

162

Comparison of Thyristor-Rectifier with Hybrid Filter and Chopper-Rectifier for High-Power, High-Current Application  

E-Print Network [OSTI]

performance, efficiency, size and cost for an industrial load with given sys- tem specifications. 1 and chemical industries [1]-[6]. Chemical electrolysis is used in metal refining (from impure stock) and metal winning (from ore) [2]. Hydrogen, chlorine, sodium hydroxide, sodium chlorate, ox- ygen and adiponitrile

Paderborn, Universität

163

Maximum Power Point Tracking Control for Photovoltaic System Using Adaptive Neuro-Fuzzy  

E-Print Network [OSTI]

conventional controller like Adaptive Neuro-Fuzzy "ANFIS" and fuzzy logic controller is proposed and simulated power point tracking (MPPT) technique will be used. Fuzzy logic control "FLC" and adaptive neuro-fuzzyMaximum Power Point Tracking Control for Photovoltaic System Using Adaptive Neuro- Fuzzy "ANFIS

Paris-Sud XI, Université de

164

Power and Frequency Control as it Relates to Wind-Powered Generation  

E-Print Network [OSTI]

of large amounts of wind power production might requirewill be satisfactory as wind power provides an increasing64   7.2   Wind Power in Relation to System

Lacommare, Kristina S H

2011-01-01T23:59:59.000Z

165

Method and apparatus for controlling a microturbine  

DOE Patents [OSTI]

An apparatus for controlling a microturbine, the apparatus including: a rectifier adapted for converting at least one generated voltage from the microturbine to a DC link voltage; an inverter adapted for converting the DC link voltage to at least one inverter output voltage, the at least one inverter output voltage being electrically coupled to an external power bus; a starter drive adapted for converting at least one starter input voltage to at least one starter output voltage, the at least one starter input voltage being electrically coupled to the external power bus, the at least one starter output voltage being electrically coupled to the microturbine.

Garces, Luis Jose; Cardinal, Mark Edward; Sinha, Gautam; Dame, Mark Edward

2005-08-02T23:59:59.000Z

166

Active Harmonic Filtering Using Current Controlled Grid-Connected DG Units with Closed-Loop Power Control  

E-Print Network [OSTI]

1 Active Harmonic Filtering Using Current Controlled Grid- Connected DG Units with Closed converters to actively compensate harmonics, this paper proposes an enhanced current control approach, which seamlessly integrates system harmonic mitigation capabilities with the primary DG power generation function

Berning, Torsten

167

Voltage Control of Distribution Networks with Distributed Generation using Reactive Power  

E-Print Network [OSTI]

Voltage Control of Distribution Networks with Distributed Generation using Reactive Power to control voltage of distribution networks with DG using reactive power compensation approach. In this paper profile within the specified limits, it is essential to regulate the reactive power of the compensators

Pota, Himanshu Roy

168

RELIABILITY ANALYSIS IN A FAULT TOLERANT CONTROL STRATEGY DEDICATED TO ACTIVE POWER FILTER  

E-Print Network [OSTI]

RELIABILITY ANALYSIS IN A FAULT TOLERANT CONTROL STRATEGY DEDICATED TO ACTIVE POWER FILTER P. WEBER on reliability analysis dedicated to an active power filter. Once a fault has been detected and isolated, all reliability indicate the optimal structure. Keywords: Fault Tolerant Control, System Reliability, Active power

Paris-Sud XI, Université de

169

Grid-Connected Marine Current Generation System Power Smoothing Control Using Supercapacitors  

E-Print Network [OSTI]

Grid-Connected Marine Current Generation System Power Smoothing Control Using Supercapacitors to reduce the fluctuation of generator power. In the second step, Supercapacitor (SC) Energy Storage System fluctuation, swell effect, power smoothing control, supercapacitor. I. [NTRODUCTION [n the recent years

Paris-Sud XI, Université de

170

Individual Pitch Control for Mitigation of Power Fluctuation of Variable Speed Wind Turbines  

E-Print Network [OSTI]

Individual Pitch Control for Mitigation of Power Fluctuation of Variable Speed Wind Turbines, China mcheng@seu.edu.cn Abstract-- Grid connected wind turbines are the sources of power fluctuations presents an individual pitch control (IPC) strategy to mitigate the wind turbine power fluctuation at both

Hu, Weihao

171

Gain Scheduled Control of a Solar Power Plant Tor A. Johansen1  

E-Print Network [OSTI]

Gain Scheduled Control of a Solar Power Plant Tor A. Johansen1 , Kenneth J. Hunt2 and Idar Petersen to a pilot-scale solar power plant is described. A eld of parabolic collectors focus the solar radiation onto a tube where oil is pumped through in order to collect the solar power. The control problem is to keep

Johansen, Tor Arne

172

Inserting Test Points to Control Peak Power During Scan Testing Ranganathan Sankaralingam and Nur A. Touba  

E-Print Network [OSTI]

simply reducing the average power dissipation per clock cycle. Proceedings of the 17th IEEE International. The average power dissipation during scan testing can be controlled by reducing the scan frequency. However, the peak power during scan testing cannot be controlled by reducing clock frequency and hence is more

Touba, Nur A.

173

Power Control in Spectrum Overlay Networks: How to Cross a Multi-Lane Highway  

E-Print Network [OSTI]

Power Control in Spectrum Overlay Networks: How to Cross a Multi-Lane Highway Wei Ren, Qing Zhao Research Laboratory, Adelphi, MD 20783 Email: aswami@arl.army.mil Abstract--We consider power control interference to primary users. We quantify the impact of the transmission power of secondary users

Islam, M. Saif

174

"BLUE BOX" POWER ELECTRONICS CONTROL MODULES FOR LABORATORY-BASED EDUCATION  

E-Print Network [OSTI]

"BLUE BOX" POWER ELECTRONICS CONTROL MODULES FOR LABORATORY-BASED EDUCATION R. S. BALOG, J. W of Illinois at Urbana/Champaign Urbana, Illinois 61801 #12;#12;UILU-ENG-2004-2504 "BLUE BOX" POWER ELECTRONICS of design documents detailing the design and fabrication of "blue box" power electronics control modules

Kimball, Jonathan W.

175

ITERATIVE POWER CONTROL FOR MULTIMEDIA WIRELESS COMMUNICATIONS Onur Sahin, Elza Erkip, and David Goodman  

E-Print Network [OSTI]

, such as channel conditions, required end-to-end distortion, etc. and finds the optimal operating powers of all power control algorithm and prove con- vergence. The simulations for Gauss-Markov source with transform consumes power comparable to transmission power, which necessities joint optimization of source encoder

Erkip, Elza

176

Ancillary Frequency Control of Direct Drive Full-Scale Converter Based Wind Power Plants  

E-Print Network [OSTI]

presents a simulation model of a wind power plant based on a MW-level variable speed wind turbineAncillary Frequency Control of Direct Drive Full-Scale Converter Based Wind Power Plants Weihao Hu with a full-scale back-to-back power converter developed in the simulation tool of DIgSILENT Power Factory

Chen, Zhe

177

Model-Free Based Water Level Control for Hydroelectric Power Plants  

E-Print Network [OSTI]

Model-Free Based Water Level Control for Hydroelectric Power Plants CĂ©dric JOIN GĂ©rard ROBERT for hydroelectric run-of-the river power plants. To modulate power generation, a level trajectory is planned, the set-point is followed even in severe operating conditions. Keywords: Hydroelectric power plants

Paris-Sud XI, Université de

178

Co-design of Embedded Controllers for Power Electronics and Electric Systems  

E-Print Network [OSTI]

, Electric process. I. INTRODUCTION Today, variable speed motor control systems have a wide rangeCo-design of Embedded Controllers for Power Electronics and Electric Systems Slim Ben Saoud L for the design of control systems for power electronics and electric drives. We discuss the case of a DC system

California at Irvine, University of

179

The Hybrid Power Flow Controller A New Concept for Flexible AC Transmission  

E-Print Network [OSTI]

The Hybrid Power Flow Controller A New Concept for Flexible AC Transmission Jovan Z. Bebic Electric flow controller topologies are proposed for flexible AC transmission systems (FACTS). The first one or series capacitors can be enhanced to generalized power flow control ­ a functionality commonly associated

Lehn, Peter W.

180

Proportional EMG Control of Ankle Plantar Flexion in a Powered Transtibial Prosthesis  

E-Print Network [OSTI]

Proportional EMG Control of Ankle Plantar Flexion in a Powered Transtibial Prosthesis Jing Wang plantar flexion in the trailing prosthetic ankle increases. Not surprisingly, excessive loads to control a powered ankle- foot prosthesis using a volitional electromyographic (EMG) control to directly

Herr, Hugh

Note: This page contains sample records for the topic "rectifier power control" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


181

Power Controlled Minimum Frame Length Scheduling in TDMA Wireless Networks with  

E-Print Network [OSTI]

Power Controlled Minimum Frame Length Scheduling in TDMA Wireless Networks with Sectored Antennas controlled min- imum frame length scheduling for TDMA wireless networks. Given a set of one-hop transmission scheduling and power control was first addressed by Tamer and Ephremides in [1, 2]. Given a set of one

Arabshahi, Payman

182

Interline Photovoltaic (I-PV) power system - A novel concept of power flow control and management  

E-Print Network [OSTI]

This paper presents a new system configuration for a large-scale Photovoltaic (PV) power system with multi-line transmission/distribution networks. A PV power plant is reconfigured in a way that two adjacent power system ...

Khadkikar, Vinod

183

Power control of a wind farm with active stall wind turbines and AC grid connection  

E-Print Network [OSTI]

Power control of a wind farm with active stall wind turbines and AC grid connection Anca D. Hansen1 controller for a wind farm made-up exclusively of active stall wind turbines with AC grid connection wind farm control involves both the control on wind turbine level as well as the central control

184

The Optimal Power Tracking Control Strategy of Grid-Connected Excited Synchronous Wind Power Generator.  

E-Print Network [OSTI]

??In this thesis, the wind power system is a coaxial coupling structure between servo motor and excited synchronous wind power generator. By using the excited… (more)

Cheng, Wen-kai

2014-01-01T23:59:59.000Z

185

Speed And Power Control Of An Engine By Modulation Of The Load Torque  

DOE Patents [OSTI]

A system and method of speed and power control for an engine in which speed and power of the engine is controlled by modulation of the load torque. The load torque is manipulated in order to cause engine speed, and hence power to be changed. To accomplish such control, the load torque undergoes a temporary excursion in the opposite direction of the desired speed and power change. The engine and the driven equipment will accelerate or decelerate accordingly as the load torque is decreased or increased, relative to the essentially fixed or constant engine torque. As the engine accelerates or decelerates, its power increases or decreases in proportion.

Ziph, Benjamin (Ann Arbor, MI); Strodtman, Scott (Ypsilanti, MI); Rose, Thomas K (Chelsea, MI)

1999-01-26T23:59:59.000Z

186

Instantaneous Active and Nonactive Power Control of Distributed Energy Resources with Current Limiter  

SciTech Connect (OSTI)

Abstract -- Distributed energy resources (DER) with a power electronics inverter interface can provide both active power and nonactive power simultaneously and independently. A decoupled control algorithm of active power and nonactive power is developed based on the instantaneous active power and nonactive power theory. A current limiter is combined to the control algorithm, and it ensures that the inverter is not overloaded. During the normal system operation, the active power has higher priority over the nonactive power so that the energy from a DER can be fully transferred to the grid. Within the inverter s capability, nonactive power is provided to the grid as required. With this control algorithm, the inverter s capabilities are taken full advantage at all times, both in terms of functionality as well as making use of its full KVA rating. Through the algorithm, the inverter s active power and nonactive power are controlled directly, simultaneously, and independently. Several experimental results fully demonstrate the validity and effectiveness of this new control algorithm. As evidenced by the fast dynamic response that results, a DER system with the control algorithm can provide full services to the grid in both steady state and during transient events.

Xu, Yan [ORNL; Li, Huijuan [ORNL; Rizy, D Tom [ORNL; Li, Fangxing [ORNL; Kueck, John D [ORNL

2010-01-01T23:59:59.000Z

187

Frequency Control Of Micro Hydro Power Plant Using Electronic Load Controller  

E-Print Network [OSTI]

Water turbines, like petrol or diesel engines, will vary in speed as load is applied or relieved. Although not such a great problem with machinery which uses direct shaft power, this speed variation will seriously affect both frequency and voltage output from a generator. Traditionally, complex hydraulic or mechanical speed governors altered flow as the load varied, but more recently an electronic load controller (ELC) has been developed which has increased the simplicity and reliability of modern micro-hydro sets. An ELC is a solid-state electronic device designed to regulate output power of a micro-hydropower system and maintaining a near-constant load on the turbine generates stable voltage and frequency. In this paper an ELC constantly senses and regulates the generated frequency. The frequency is directly proportional to the speed of the turbine.

unknown authors

188

Power control architectures for cold cathode fluorescent lamp and light emitting diode based light sources.  

E-Print Network [OSTI]

?? In this dissertation, two different energy efficient power supply topologies are introduced for controlling cold cathode fluorescent lamp (CCFL) and high-brightness light emitting diode… (more)

Doshi, Montu V.

2010-01-01T23:59:59.000Z

189

Electric Power Esearch Institute: Environmental Control Technology Center  

SciTech Connect (OSTI)

Operations and maintenance continued this month at the Electric Power Research Institute`s (EPRI`s) Environmental Control Technology Center (ECTC). Testing for the month involved the EPRI Integrated SO{sub x}/NO{sub x} removal process, the DOE PRDA testing of the B&W/Condensing Heat Exchanger (CHX), and support for the Semi-Continuous On-line Mercury Analyzer. The test configuration utilized in the EPRI Integrated SO{sub x}/NO{sub x} removal process included the 4.0 MW Spray Dryer Absorber (SDA), the Pulse-jet Fabric Filter (PJFF), and a new Selective Catalytic Reduction (SCR) reactor installed at the ECTC. During this testing, O&M support was also required to conclude the test efforts under the EPRI Hazardous Air Pollutant (HAP) test block. This included the on-site development efforts for the Semi-Continuous On-line Mercury Analyzer. In the DOE PRDA project with the B&W/Condensing Heat Exchanger (CHX), the effects of the increased particulate loading to the unit were monitored throughout the month. Also, the 1.0 MW Cold-Side Selective Catalytic Reduction (SCR) unit and the 4.0 MW Pilot Wet Scrubber remained idle this month in a cold-standby mode and were inspected regularly.

NONE

1996-11-01T23:59:59.000Z

190

Model Predictive Control in Power Electronics: A Hybrid Systems Approach  

E-Print Network [OSTI]

to transform electrical power from one ­ usually unregulated ­ form to another regulated one (consider e of semiconductor devices that operate as power switches, turning on and off with a high switching frequency. From of an underlying optimization problem. Given the high switching frequency used in power electronics app

Sontag, Eduardo

191

Direct power control of grid connected PV systems with three level NPC inverter  

SciTech Connect (OSTI)

This paper presents the control of a three-level Neutral Point Clamped (NPC) voltage source inverter for grid connected photovoltaic (PV) systems. The control method used is the Extended Direct Power Control (EDPC), which is a generic approach for Direct Power Control (DPC) of multilevel inverters based on geometrical considerations. Maximum Power Point Tracking (MPPT) algorithms, that allow maximal power conversion into the grid, have been included. These methods are capable of extracting maximum power from each of the independent PV arrays connected to each DC link voltage level. The first one is a conventional MPPT which outputs DC link voltage references to EDPC. The second one is based on DPC concept. This new MPPT outputs power increment references to EDPC, thus avoiding the use of a DC link voltage regulator. The whole control system has been tested on a three-level NPC voltage source inverter connected to the grid and results confirm the validity of the method. (author)

Alonso-Martinez, Jaime; Eloy-Garcia, Joaquin; Arnaltes, Santiago [Dept. of Electrical Engineering, University Carlos III of Madrid, Avda. Universidad 30, 28911 Leganes, Madrid (Spain)

2010-07-15T23:59:59.000Z

192

Systems and methods for providing power to a load based upon a control strategy  

DOE Patents [OSTI]

Systems and methods are provided for an electrical system. The electrical system includes a load, an interface configured to receive a voltage from a voltage source, and a controller configured to receive the voltage from the voltage source through the interface and to provide a voltage and current to the load. Wherein, when the controller is in a constant voltage mode, the controller provides a constant voltage to the load, when the controller is in a constant current mode, the controller provides a constant current to the load, and when the controller is in a constant power mode, the controller provides a constant power to the load.

Perisic, Milun; Kajouke, Lateef A; Ransom, Ray M

2013-12-24T23:59:59.000Z

193

Advanced regulatory control and coordinated plant-wide control strategies for IGCC targeted towards improving power ramp-rates  

SciTech Connect (OSTI)

As part of ongoing R&D activities at the National Energy Technology Laboratory's (NETL) Advanced Virtual Energy Simulation Training & Research (AVESTAR™) Center, this paper highlights strategies for enhancing low-level regulatory control and system-wide coordinated control strategies implemented in a high-fidelity dynamic simulator for an Integrated Gasification Combined Cycle (IGCC) power plant with carbon capture. The underlying IGCC plant dynamic model contains 20 major process areas, each of which is tightly integrated with the rest of the power plant, making individual functionally-independent processes prone to routine disturbances. Single-loop feedback control although adequate to meet the primary control objective for most processes, does not take into account in advance the effect of these disturbances, making the entire power plant undergo large offshoots and/or oscillations before the feedback action has an opportunity to impact control performance. In this paper, controller enhancements ranging from retuning feedback control loops, multiplicative feed-forward control and other control techniques such as split-range control, feedback trim and dynamic compensation, applicable on various subsections of the integrated IGCC plant, have been highlighted and improvements in control responses have been given. Compared to using classical feedback-based control structure, the enhanced IGCC regulatory control architecture reduces plant settling time and peak offshoots, achieves faster disturbance rejection, and promotes higher power ramp-rates. In addition, improvements in IGCC coordinated plant-wide control strategies for “Gasifier-Lead”, “GT-Lead” and “Plantwide” operation modes have been proposed and their responses compared. The paper is concluded with a brief discussion on the potential IGCC controller improvements resulting from using advanced process control, including model predictive control (MPC), as a supervisory control layer.

Mahapatra, P.; Zitney, S.

2012-01-01T23:59:59.000Z

194

A Novel Three-Phase Rectifier with Reduced THD Gregory Ivensky and Sam Ben-Yaakov  

E-Print Network [OSTI]

- directional switches (such as BJT, MOSFET, IGBT or GTO) and 24 diodes that are switched at low frequency processes within the rectifier bridges proceed instantly. Voltage waveforms of the bridges are presented

195

Analysis of three-phase rectifiers with constant-voltage loads  

E-Print Network [OSTI]

This work presents a quantitative analysis of the operating characteristics of three-phase diode bridge rectifiers with AC-side reactance and constant-voltage loads. We focus on the case where the AC-side currents vary ...

Caliskan, Vahe

196

Lillgrund Wind Farm Modelling and Reactive Power Control.  

E-Print Network [OSTI]

?? The installation of wind power plant has significantly increased since several years due to the recent necessity of creating renewable and clean energy sources.… (more)

Boulanger, Isabelle

2009-01-01T23:59:59.000Z

197

Thermal Control of Power Electronics of Electric Vehicles with...  

Broader source: Energy.gov (indexed) [DOE]

RelevanceObjectives Objectives: * Explore the potential of nucleate boiling for vehicle power electronics cooling. * Conduct numerical heat transfer simulations. * Experimentally...

198

Air Cooling Technology for Power Electronic Thermal Control  

Broader source: Energy.gov (indexed) [DOE]

Motors (APEEM) technical targets * Air is a poor heat-transfer fluid - low specific heat - low density - low conductivity * Parasitic power * Perception and novelty The...

199

Virtual Power Plant Simulation and Control Scheme Design.  

E-Print Network [OSTI]

?? Virtual Power Plant (VPP) is a concept that aggregate Distributed Energy Resources (DER) together, aims to overcome the capacity limits of single DER and… (more)

Chen, Zhenwei

2012-01-01T23:59:59.000Z

200

Microsoft PowerPoint - Module 12 - Instrumentation and Control...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

C to - Steam supply temperature can be held within 3 C to maintain high plant efficiency at lowered power - Reactor component and fuel temperatures can be maintained well...

Note: This page contains sample records for the topic "rectifier power control" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


201

North American Power Symposium NAPS, Cleveland, Ohio, October 1998, pp. 294 299. Fundamental Frequency Model of Uni ed Power Flow Controller  

E-Print Network [OSTI]

Frequency Model of Uni ed Power Flow Controller Edvina Uzunovic Claudio A. Ca~nizares John Reeve University and modeling technique used to rep- resent a Uni ed Power Flow Controller UPFC are presented in this paper, Static Synchronous Series Compensator SSSC, and Uni- ed Power Flow Controller UPFC 2 . The STATCOM

Cañizares, Claudio A.

202

Distributed Battery Control to Improve Peak Power Shaving Efficiency in Data Centers  

E-Print Network [OSTI]

Rack PDU BackupMain Bus-type power network Utility Diesel Generator ATS PDU Server Rack Server RackDistributed Battery Control to Improve Peak Power Shaving Efficiency in Data Centers Baris Aksanli, Eddie Pettis and Tajana S. Rosing UCSD, Google Stored energy in batteries can be used to cap peak power

Simunic, Tajana

203

Pricing Hydroelectric Power Plants with/without Operational Restrictions: a Stochastic Control Approach  

E-Print Network [OSTI]

Pricing Hydroelectric Power Plants with/without Operational Restrictions: a Stochastic Control of Waterloo, Waterloo ON, Canada N2L 3G1 Abstract. In this paper, we value hydroelectric power plant cash operational constraints may considerably overestimate the value of hydroelectric power plant cashflows. 1

Forsyth, Peter A.

204

Control and Protection of Wind Power Plants with VSC-HVDC Connection  

E-Print Network [OSTI]

advantage of the lower cost per MW of installed wind power capacity. The current trend is that these largeControl and Protection of Wind Power Plants with VSC-HVDC Connection By Sanjay K Chaudhary Wind power plants are the fastest growing source of renewable energy. The European Union expects

Chaudhary, Sanjay

205

CONTROL SYSTEM FOR MAGNET POWER SUPPLIES FOR NOVOSIBIRSK FREE ELECTRON LASER  

E-Print Network [OSTI]

- power supplies are very small and do not require water cooling. Therefore it is very convenientCONTROL SYSTEM FOR MAGNET POWER SUPPLIES FOR NOVOSIBIRSK FREE ELECTRON LASER Yu.M.Velikanov, V electron laser (FEL) is described. The characteristics and structure of the power supply system

Kozak, Victor R.

206

Quantitative Analysis of Transmission Power Control in Wireless Ad-hoc Networks  

E-Print Network [OSTI]

1 Quantitative Analysis of Transmission Power Control in Wireless Ad-hoc Networks Seung-Jong Park the issue of transmission power con- trol in wireless ad-hoc networks. In general, it is assumed that minimum transmission power achieves the optimal throughput of an ad-hoc network because it produces

Park, Seung-Jong "Jay"

207

Controlled Use of a Robot Colony Power Supply Gary B. Parker  

E-Print Network [OSTI]

recharge and release power more quickly. Two forms of charging are solar panels and a continuous power station. Brooks used a robot, Attila, which had batteries and recharged with solar panels [4]. This systemControlled Use of a Robot Colony Power Supply Gary B. Parker Computer Science Connecticut College

Parker, Gary B.

208

Hierarchical Control Strategy for a Hybrid Hydro-mechanical Transmission (HMT) Power-Train  

E-Print Network [OSTI]

Hierarchical Control Strategy for a Hybrid Hydro-mechanical Transmission (HMT) Power-Train Kai Loon a Hydro-mechanical Transmission (HMT) or power-split archi- tecture is being developed as a testbed within hybrid powertrain has a hydro- mechanical transmission (HMT) or power-split architecture. This combines

Li, Perry Y.

209

MODELLING AND CONTROL OF CO-GENERATION POWER PLANTS UNDER CONSIDERATION OF  

E-Print Network [OSTI]

MODELLING AND CONTROL OF CO-GENERATION POWER PLANTS UNDER CONSIDERATION OF LIFETIME CONSUMPTION of a combined cycle power plant under consideration of the real cost of lifetime usage is accomplished behavior of a combined cycle power plant. In order to model both the continuous/discrete dynamics

Ferrari-Trecate, Giancarlo

210

Design of a Norm-Bounded LQG Controller for Power Distribution Networks with Distributed Generation  

E-Print Network [OSTI]

of research. Due to the increased demand for electric power, large scale penetration of distibuted energy. Therefore, control of modern electric power systems becomes more and more challenging as the present trends electrical and electromechanical power systems involve a wide range of resonant oscillatory modes [2]. Due

Pota, Himanshu Roy

211

Neutral Beam Power System for TPX  

SciTech Connect (OSTI)

The Tokamak Physics Experiment (TPX) will utilize to the maximum extent the existing Tokamak Fusion Test Reactor (TFTR) equipment and facilities. This is particularly true for the TFTR Neutral Beam (NB) system. Most of the NB hardware, plant facilities, auxiliary sub-systems, power systems, service infrastructure, and control systems can be used as is. The major changes in the NB hardware are driven by the new operating duty cycle. The TFTR Neutral Beam was designed for operation of the Sources for 2 seconds every 150 seconds. The TPX requires operation for 1000 seconds every 4500 seconds. During the Conceptual Design Phase of TPX every component of the TFTR NB Electrical Power System was analyzed to verify whether the equipment can meet the new operational requirements with our without modifications. The Power System converts 13.8 kV prime power to controlled pulsed power required at the NB sources. The major equipment involved are circuit breakers, auto and rectifier transformers surge suppression components, power tetrodes, HV Decks, and HVDC power transmission to sources. Thermal models were developed for the power transformers to simulate the new operational requirements. Heat runs were conducted for the power tetrodes to verify capability. Other components were analyzed to verify their thermal limitations. This paper describes the details of the evaluation and redesign of the electrical power system components to meet the TPX operational requirements.

Ramakrishnan, S.; Bowen, O.N.; O`Conner, T.; Edwards, J.; Fromm, N.; Hatcher, R.; Newman, R.; Rossi, G.; Stevenson, T.; von Halle, A.

1993-11-01T23:59:59.000Z

212

Low-Power Maximum Power Point Tracker with Digital Control for Thermophotovoltaic Generators  

E-Print Network [OSTI]

This paper describes the design, optimization, and evaluation of the power electronics circuitry for a low-power portable thermophotovotaic (TPV) generator system. TPV system is based on a silicon micro-reactor design and ...

Pilawa, Robert

213

Robust control for wind power systems A. Pintea 1,2  

E-Print Network [OSTI]

Robust control for wind power systems A. Pintea 1,2 , D. Popescu 1 , P. Borne 2 1 University input and has shown good robustness indicator values. Keywords: Wind power, robustness, renewable energy advantages of wind turbine usage, engineers build different control systems and optimized their functioning

Paris-Sud XI, Université de

214

Control of Ultracapacitor-Battery Hybrid Power Source for Vehicular Applications  

E-Print Network [OSTI]

with 97-98% typical efficiency. I. INTRODUCTION Batteries often constitute the energy storage systemControl of Ultracapacitor-Battery Hybrid Power Source for Vehicular Applications Jonathan J of this work in other works must be obtained from the IEEE. #12;Control of Ultracapacitor-Battery Hybrid Power

215

NOISE CONTROL METHODS FOR A RECIPROCATING AIR COMPRESSOR USED IN FUEL CELL AUXILIARY POWER UNIT (APU)  

E-Print Network [OSTI]

NOISE CONTROL METHODS FOR A RECIPROCATING AIR COMPRESSOR USED IN FUEL CELL AUXILIARY POWER UNIT Air pollution Noise pollution Engine life Remedy Fuel cell APU Quieter Low emissions Exhaust Heat, Case History: Noise control approaches for an air-compressor in a fuel-cell auxiliary power unit, Noise

Carver, Jeffrey C.

216

Prognostic Control and Load Survivability in Shipboard Power Systems  

E-Print Network [OSTI]

...............................................................................................9? 2.5? Reliability Centered Maintenance ........................................................10? 2.6? Power Distribution System Reliability .................................................13? 2.7? Summary... centered maintenance (RCM), and power distribution system reliability techniques are principles are mentioned as well. In chapter III, the modeling principles of structure functions and survivability are stated. The 3 problem formulation is also...

Thomas, Laurence J.

2011-02-22T23:59:59.000Z

217

Cyber-Vulnerability of Power Grid Monitoring and Control Systems  

E-Print Network [OSTI]

, a methodology is proposed for the evaluation of the impact of cyber attacks on the power grid-effect on the proposed method determines the likelihood of the consequence, which can be evaluated based on a substation networks can lead to undesirable switching operations executed by attackers, resulting in widespread power

Manimaran, Govindarasu

218

Electrical power inverter having a phase modulated, twin-inverter, high frequency link and an energy storage module  

DOE Patents [OSTI]

The present invention provides an electrical power inverter method and apparatus, which includes a high frequency link, for converting DC power into AC power. Generally stated, the apparatus includes a first high frequency module which produces an AC voltage at a first output frequency, and a second high frequency inverter module which produces an AC voltage at a second output frequency that is substantially the same as the first output frequency. The second AC voltage is out of phase with the first AC voltage by a selected angular phase displacement. A mixer mixes the first and second output voltages to produce a high frequency carrier which has a selected base frequency impressed on the sidebands thereof. A rectifier rectifies the carrier, and a filter filters the rectified carrier. An output inverter inverts the filtered carrier to produce an AC line voltage at the selected base frequency. A phase modulator adjusts the relative angular phase displacement between the outputs of the first and second high frequency modules to control the base frequency and magnitude of the AC line voltage. 19 figs.

Pitel, I.J.

1987-02-03T23:59:59.000Z

219

Electrical power inverter having a phase modulated, twin-inverter, high frequency link and an energy storage module  

DOE Patents [OSTI]

The present invention provides an electrical power inverter method and apparatus, which includes a high frequency link, for converting DC power into AC power. Generally stated, the apparatus includes a first high frequency module which produces an AC voltage at a first output frequency, and a second high frequency inverter module which produces an AC voltage at a second output frequency that is substantially the same as the first output frequency. The second AC voltage is out of phase with the first AC voltage by a selected angular phase displacement. A mixer mixes the first and second output voltages to produce a high frequency carrier which has a selected base frequency impressed on the sidebands thereof. A rectifier rectifies the carrier, and a filter filters the rectified carrier. An output inverter inverts the filtered carrier to produce an AC line voltage at the selected base frequency. A phase modulator adjusts the relative angular phase displacement between the outputs of the first and second high frequency modules to control the base frequency and magnitude of the AC line voltage.

Pitel, Ira J. (Whippany, NJ)

1987-02-03T23:59:59.000Z

220

A Hierarchical Control Algorithm for Managing Electrical Energy Storage Systems in Homes Equipped with PV Power Generation  

E-Print Network [OSTI]

use their PV-based generation and controllable storage devices for peak shaving on their power demand controller should possess the ability of forecasting future PV-based power generation and load power consumption profiles for better performance. In this paper we present novel PV power generation and load power

Pedram, Massoud

Note: This page contains sample records for the topic "rectifier power control" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


221

Experience curves for power plant emission control technologies  

E-Print Network [OSTI]

hazardous air pollutant removal’, Proceeding of SO 2 Controlto control emissions of harmful air pollutants from electric

Rubin, Edward S.; Yeh, Sonia; Hounshell, David A; Taylor, Margaret R

2007-01-01T23:59:59.000Z

222

International Journal of Systems Science, 2000, volume 31, number 4, pages 519 527 Multi machine power system excitation control design via theories  

E-Print Network [OSTI]

voltage direct current (HVDC) power control design and static voltage condensor (SVC) control design (Lu

Qu, Zhihua

223

Analysis and synthesis of HVDC controls for robust stability of power systems  

SciTech Connect (OSTI)

High Voltage DC (HVDC) links have controllable characteristics with potential for affecting system stability. This paper follows the robustness methodology procedure to analyze the stability robustness of HVDC controls in power systems over a range of operating conditions. A novel method to design power system controllers using the robustness methodology is also proposed. Numerical results for a sample test-system are obtained and compared with those obtained by conventional techniques.

Venkataraman, S.; Khammash, M.H.; Vittal, V. [Iowa State Univ., Ames, IA (United States). Dept. of Electrical Engineering and Computer Engineering] [Iowa State Univ., Ames, IA (United States). Dept. of Electrical Engineering and Computer Engineering

1995-11-01T23:59:59.000Z

224

Controller Design and Implementation for a Powered Prosthetic Knee  

E-Print Network [OSTI]

like more powerful electric motors and higher capacityleg through the use of an electric motor-driven ball-screwa torque with an electric motor even when no mechanical work

Rosa, Matthew David

2012-01-01T23:59:59.000Z

225

Adaptive primary side control for a wireless power transfer optimization  

E-Print Network [OSTI]

A resonant inductive wireless power transfer system, consisting of a primary (transmitter) circuit and secondary (receiver) circuit, was designed and implemented. This document also contains a novel indirect feedback method ...

Bogoda, Thilani Imanthika Dissanayake

2012-01-01T23:59:59.000Z

226

Genetic Algorithm Based Damage Control For Shipboard Power Systems  

E-Print Network [OSTI]

Power system level. The proposed method used a constrained binary genetic algorithm to find an optimal network configuration. An optimal network configuration is a configuration which restores all of the de-energized loads that are possible...

Amba, Tushar

2010-07-14T23:59:59.000Z

227

Design of control for efficiency of AUV power systems  

E-Print Network [OSTI]

The MIT Rapid Development Group designed and built an internal combustion hybrid recharging system for the REMUS 600 Autonomous Underwater Vehicle (AUV) in collaboration with the MIT Lincoln Laboratory. This power system ...

Ware, Laura M. (Laura Marie)

2012-01-01T23:59:59.000Z

228

Control strategies for supercritical carbon dioxide power conversion systems  

E-Print Network [OSTI]

The supercritical carbon dioxide (S-C02) recompression cycle is a promising advanced power conversion cycle which couples well to numerous advanced nuclear reactor designs. This thesis investigates the dynamic simulation ...

Carstens, Nathan, 1978-

2007-01-01T23:59:59.000Z

229

Performance of ECM controlled VAV fan powered terminal units  

E-Print Network [OSTI]

signal from low pass filter h Enthalpy HVAC Heating, Ventilation, & Air Conditioning IRMS RMS value of current (amps) ? ? m mass flow rate Piav Inlet air velocity differential pressure Pdown Downstream static pressure Punit... Static pressure inside terminal unit Pup Upstream static pressure Powerfan Power consumption of terminal unit fan PF Power Factor PSC Permanent Split Capacitor ? ? Q Change in heat input per unit time Qfan Amount of airflow through...

Cramlet, Andrew Charles

2009-05-15T23:59:59.000Z

230

Power Supply Changes for NSTX Resistive Wall Mode Coils  

SciTech Connect (OSTI)

The National Spherical Torus Experiment (NSTX) has been designed and installed in the existing facilities at Princeton Plasma Physics Laboratory (PPPL). Most of the hardware, plant facilities, auxiliary sub-systems, and power systems originally used for the Tokamak Fusion Test Reactor (TFTR) have been used with suitable modifications to reflect NSTX needs. Prior to 2004, the NSTX power system was feeding twelve (12) circuits in the machine. In 2004 the Resistive Wall Mode (RWM) Coils were installed on the machine to correct error fields. There are six of these coils installed around the machine in the mid-plane. Since these coils need fast and accurate controls, a Switching Power Amplifier (SPA) with three sub-units was procured, installed and commissioned along with other power loop components. Two RWM Coils were connected in series and fed from one SPA sub-unit. After the initial RWM campaign, operational requirements evolved such that each of the RWM coils now requires separate power and control. Hence a second SPA with three sub-units has been procured and installed. The second unit is of improved design and has the controls and power components completely isolated. The existing thyristor rectifier is used as DC Link to both of the Switching Power Amplifiers. The controls for the RWM are integrated into the overall computer control of the DC Power systems for NSTX. This paper describes the design changes in the RWM Power system for NSTX.

Ramakrishnan, S S.

2013-06-28T23:59:59.000Z

231

Load controller and method to enhance effective capacity of a photovoltaic power supply  

DOE Patents [OSTI]

A load controller and method are provided for maximizing effective capacity of a non-controllable, renewable power supply coupled to a variable electrical load also coupled to a conventional power grid. Effective capacity is enhanced by monitoring power output of the renewable supply and loading, and comparing the loading against the power output and a load adjustment threshold determined from an expected peak loading. A value for a load adjustment parameter is calculated by subtracting the renewable supply output and the load adjustment parameter from the current load. This value is then employed to control the variable load in an amount proportional to the value of the load control parameter when the parameter is within a predefined range. By so controlling the load, the effective capacity of the non-controllable, renewable power supply is increased without any attempt at operational feedback control of the renewable supply. The renewable supply may comprise, for example, a photovoltaic power supply or a wind-based power supply.

Perez, Richard (Delmar, NY)

2000-01-01T23:59:59.000Z

232

Testing Active Power Control from Wind Power at the National Wind Technology Center (NWTC) (Presentation)  

SciTech Connect (OSTI)

In order to keep the electricity grid stable and the lights on, the power system relies on certain responses from its generating fleet. This presentation evaluates the potential for wind turbines and wind power plants to provide these services and assist the grid during critical times.

Ela, E.

2011-05-01T23:59:59.000Z

233

Power Control for Block-Fading Channels with Peak-to-Average Power Constraints  

E-Print Network [OSTI]

.nguyen@postgrads.unisa.edu.au Albert Guill´en i F`abregas Engineering Department University of Cambridge Cambridge, CB2 1PZ, UK guillen@ieee.org Lars K. Rasmussen Institute for Telecommunications Research University of South Australia Mawson Lakes SA 5095 lars.rasmussen@unisa.edu.au Abstract-- Power allocation with peak-to-average power con

Guillén i Fàbregas, Albert

234

E-beam high voltage switching power supply  

DOE Patents [OSTI]

A high power, solid state power supply is described for producing a controllable, constant high voltage output under varying and arcing loads suitable for powering an electron beam gun or other ion source. The present power supply is most useful for outputs in a range of about 100-400 kW or more. The power supply is comprised of a plurality of discrete switching type dc-dc converter modules, each comprising a voltage regulator, an inductor, an inverter for producing a high frequency square wave current of alternating polarity, an improved inverter voltage clamping circuit, a step up transformer, and an output rectifier for producing a dc voltage at the output of each module. The inputs to the converter modules are fed from a common dc rectifier/filter and are linked together in parallel through decoupling networks to suppress high frequency input interactions. The outputs of the converter modules are linked together in series and connected to the input of the transmission line to the load through a decoupling and line matching network. The dc-dc converter modules are phase activated such that for n modules, each module is activated equally 360{degree}/n out of phase with respect to a successive module. The phased activation of the converter modules, combined with the square current waveforms out of the step up transformers, allows the power supply to operate with greatly reduced output capacitance values which minimizes the stored energy available for discharge into an electron beam gun or the like during arcing. The present power supply also provides dynamic response to varying loads by controlling the voltage regulator duty cycle using simulated voltage feedback signals and voltage feedback loops. Circuitry is also provided for sensing incipient arc currents reflected at the output of the power supply and for simultaneously decoupling the power supply circuitry from the arcing load. 7 figs.

Shimer, D.W.; Lange, A.C.

1997-03-11T23:59:59.000Z

235

E-beam high voltage switching power supply  

DOE Patents [OSTI]

A high power, solid state power supply is described for producing a controllable, constant high voltage output under varying and arcing loads suitable for powering an electron beam gun or other ion source. The present power supply is most useful for outputs in a range of about 100-400 kW or more. The power supply is comprised of a plurality of discrete switching type dc-dc converter modules, each comprising a voltage regulator, an inductor, an inverter for producing a high frequency square wave current of alternating polarity, an improved inverter voltage clamping circuit, a step up transformer, and an output rectifier for producing a dc voltage at the output of each module. The inputs to the converter modules are fed from a common dc rectifier/filter and are linked together in parallel through decoupling networks to suppress high frequency input interactions. The outputs of the converter modules are linked together in series and connected to the input of the transmission line to the load through a decoupling and line matching network. The dc-dc converter modules are phase activated such that for n modules, each module is activated equally 360.degree./n out of phase with respect to a successive module. The phased activation of the converter modules, combined with the square current waveforms out of the step up transformers, allows the power supply to operate with greatly reduced output capacitance values which minimizes the stored energy available for discharge into an electron beam gun or the like during arcing. The present power supply also provides dynamic response to varying loads by controlling the voltage regulator duty cycle using simulated voltage feedback signals and voltage feedback loops. Circuitry is also provided for sensing incipient arc currents reflected at the output of the power supply and for simultaneously decoupling the power supply circuitry from the arcing load.

Shimer, Daniel W. (Danville, CA); Lange, Arnold C. (Livermore, CA)

1997-01-01T23:59:59.000Z

236

Distributed control for optimal reactive power compensation in smart microgrids  

E-Print Network [OSTI]

We consider the problem of optimal reactive power compensation for the minimization of power distribution losses in a smart microgrid. We first propose an approximate model for the power distribution network, which allows us to cast the problem into the class of convex quadratic, linearly constrained, optimization problems. We also show how this model provides the tools for a distributed approach, in which agents have a partial knowledge of the problem parameters and state, and can only perform local measurements. Then, we design a randomized, gossip-like optimization algorithm, providing conditions for convergence together with an analytic characterization of the convergence speed. The analysis shows that the best performance can be achieved when we command cooperation among agents that are neighbors in the smart microgrid topology. Numerical simulations are included to validate the proposed model and to confirm the analytic results about the performance of the proposed algorithm.

Bolognani, Saverio

2011-01-01T23:59:59.000Z

237

Integrated Computing, Communication, and Distributed Control of Deregulated Electric Power Systems  

SciTech Connect (OSTI)

Restructuring of the electricity market has affected all aspects of the power industry from generation to transmission, distribution, and consumption. Transmission circuits, in particular, are stressed often exceeding their stability limits because of the difficulty in building new transmission lines due to environmental concerns and financial risk. Deregulation has resulted in the need for tighter control strategies to maintain reliability even in the event of considerable structural changes, such as loss of a large generating unit or a transmission line, and changes in loading conditions due to the continuously varying power consumption. Our research efforts under the DOE EPSCoR Grant focused on Integrated Computing, Communication and Distributed Control of Deregulated Electric Power Systems. This research is applicable to operating and controlling modern electric energy systems. The controls developed by APERC provide for a more efficient, economical, reliable, and secure operation of these systems. Under this program, we developed distributed control algorithms suitable for large-scale geographically dispersed power systems and also economic tools to evaluate their effectiveness and impact on power markets. Progress was made in the development of distributed intelligent control agents for reliable and automated operation of integrated electric power systems. The methodologies employed combine information technology, control and communication, agent technology, and power systems engineering in the development of intelligent control agents for reliable and automated operation of integrated electric power systems. In the event of scheduled load changes or unforeseen disturbances, the power system is expected to minimize the effects and costs of disturbances and to maintain critical infrastructure operational.

Bajura, Richard; Feliachi, Ali

2008-09-24T23:59:59.000Z

238

Efficient Power Control for Broadcast in Wireless Communication Systems  

E-Print Network [OSTI]

we focus on the determination of minimum-energy broadcast tree construction taking into consideration- proaches (Section 3), Minimum energy broadcast tree (Section 4), Broadcast incremental power (BIP) with SIR Department of Electrical Engineering, University of Texas at San Antonio, San Antonio, TX 78249 Email

Chronopoulos, Anthony T.

239

Automated monitoring functions for improved power system operation and control  

E-Print Network [OSTI]

process that is currently taking place between IEC 61850, IEC 61970 [2] and IEC 61968 [3]. This paper tracking · Automated analysis. The status tracking function provides additional level in the process such as Digital Fault Recorder (DFR) [7], Digital Protection Relay (DPR), Power Quality Meter (PQM) [8], Remote

240

Advanced Underground Vehicle Power and Control Fuelcell Mine Locomotive  

E-Print Network [OSTI]

· Design fuelcell powerplant and metal-hydride storage to fit into existing battery compartment · Design -- Tethered -- Diesel -- Battery · Solution by fuelcells will provide cost offsets -- Lower recurring costs available battery-powered 4-ton locomotive · Remove traction battery module and use existing electric drive

Note: This page contains sample records for the topic "rectifier power control" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


241

ARTICLE IN PRESS Controlling power systems with price signals  

E-Print Network [OSTI]

several unresolved issues: problems with linear cost structures, response delays, varying costs, market in the power system even under conditions where no information was explicitly shared by the generators. This was possible under the assumption that every generator would choose to operate any- time the price offered

Tesfatsion, Leigh

242

Control of power to an inductively heated part  

DOE Patents [OSTI]

A process for induction hardening a part to a desired depth with an AC signal applied to the part from a closely coupled induction coil includes measuring the voltage of the AC signal at the coil and the current passing through the coil; and controlling the depth of hardening of the part from the measured voltage and current. The control system determines parameters of the part that are functions of applied voltage and current to the induction coil, and uses a neural network to control the application of the AC signal based on the detected functions for each part. 6 figs.

Adkins, D.R.; Frost, C.A.; Kahle, P.M.; Kelley, J.B.; Stanton, S.L.

1997-05-20T23:59:59.000Z

243

Control of power to an inductively heated part  

DOE Patents [OSTI]

A process for induction hardening a part to a desired depth with an AC signal applied to the part from a closely coupled induction coil includes measuring the voltage of the AC signal at the coil and the current passing through the coil; and controlling the depth of hardening of the part from the measured voltage and current. The control system determines parameters of the part that are functions of applied voltage and current to the induction coil, and uses a neural network to control the application of the AC signal based on the detected functions for each part.

Adkins, Douglas R. (1620 Adelita Dr. NE., Albuquerque, NM 87112); Frost, Charles A. (1039 Red Oaks Loop NE., Albuquerque, NM 87122); Kahle, Philip M. (528 Longwood Loop NE., Rio Rancho, NM 87124); Kelley, J. Bruce (13200 Blue Corn Maiden Trail NE., Albuquerque, NM 87112); Stanton, Suzanne L. (2805 Palo Alto NE., Albuquerque, NM 87112)

1997-01-01T23:59:59.000Z

244

Energy Efficient Greedy Link Scheduling and Power Control in wireless networks  

E-Print Network [OSTI]

We consider the problem of joint link scheduling and power control for wireless networks with average transmission power constraints. Due to the high computational complexity of the optimal policies, we extend the class of greedy link scheduling policies to handle average power constraints. We develop a greedy link scheduling and power control scheme GECS, with provable performance guarantees. We show that the performance of our greedy scheduler can be characterized using the Local Pooling Factor (LPF) of a network graph, which has been previously used to characterize the stability of the Greedy Maximal Scheduling (GMS) policy for wireless networks. We also simulate the performance of GECS on wireless network, and compare its performance to another candidate greedy link scheduling and power control policy.

Sridharan, Arun

2012-01-01T23:59:59.000Z

245

Experience curves for power plant emission control technologies  

E-Print Network [OSTI]

Symposium, New Orleans, LA, EPRI, Palo Alto, CA. Keeth,Symposium, Washington, D.C, EPRI, Palo Alto, CA. Keeth,analysis’, Proceeding of EPRI/DOE/EPA 1995 SO 2 Control

Rubin, Edward S.; Yeh, Sonia; Hounshell, David A; Taylor, Margaret R

2007-01-01T23:59:59.000Z

246

Variable Renewable Generation can Provide Balancing Control to the Electric Power System (Fact Sheet)  

SciTech Connect (OSTI)

As wind and solar plants become more common in the electric power system, they may be called on to provide grid support services to help maintain system reliability. For example, through the use of inertial response, primary frequency response, and automatic generation control (also called secondary frequency response), wind power can provide assistance in balancing the generation and load on the system. These active power (i.e., real power) control services have the potential to assist the electric power system in times of disturbances and during normal conditions while also potentially providing economic value to consumers and variable renewable generation owners. This one-page, two-sided fact sheet discusses the grid-friendly support and benefits renewables can provide to the electric power system.

Not Available

2013-09-01T23:59:59.000Z

247

Numeric simulation of thyristor power converters taking into consideration the firing-circuits and the closed-loop control  

E-Print Network [OSTI]

Numeric simulation of thyristor power converters taking into consideration the firing-circuits and the closed-loop control

Bordry, Frederick; Proudlock, Paul

1988-01-01T23:59:59.000Z

248

Low Power Control IC for Efficient High-Voltage Piezoelectric Driving in a Flying Robotic Insect  

E-Print Network [OSTI]

previously developed power circuits that, when combined, are capable of stepping up a 3.7V Li-poly battery ref- erence, a control register bank, and a serial programming in- terface. Fig. 2 shows a block

Wood, Robert

249

Distributed series reactance: a new approach to realize grid power flow control.  

E-Print Network [OSTI]

??The objective of the proposed research is to develop a cost-effective power flow controller to improve the utilization and reliability of the existing transmission, sub-transmission,… (more)

Johal, Harjeet

2008-01-01T23:59:59.000Z

250

Control of a Powered Ankle–Foot Prosthesis Based on a Neuromuscular Model  

E-Print Network [OSTI]

Control schemes for powered ankle-foot prostheses rely upon fixed torque-ankle state relationships obtained from measurements of intact humans walking at target speeds and across known terrains. Although effective at their ...

Geyer, Hartmut

251

Scenario-Based Fault-Tolerant Model Predictive Control for Diesel-Electric Marine Power Plant  

E-Print Network [OSTI]

Scenario-Based Fault-Tolerant Model Predictive Control for Diesel-Electric Marine Power Plant where diesel gener- ator sets (a diesel engine connected to a generator) produce electrical power, which Email: torstein.bo@itk.ntnu.no, tor.arne.johansen@itk.ntnu.no Abstract--Diesel-electric propulsion

Johansen, Tor Arne

252

Ris-R-1117(EN) Power Control for Wind Turbines in  

E-Print Network [OSTI]

Risø-R-1117(EN) Power Control for Wind Turbines in Weak Grids: Project summary Henrik Bindner (Ed in Europe large areas exist where the wind resources are good or very good and the grid is relatively weak for the exploitation of the wind resource. There are two main problems concerned with wind power and weak grids

253

Software Controlled Power Management Yung-Hsiang Lu, Tajana Simunic, Giovanni De Micheli  

E-Print Network [OSTI]

Software Controlled Power Management Yung-Hsiang Lu, Tajana Simuni´c, Giovanni De Micheli Computer in either hardware or software. A recent trend on personal computers is to use software to change hardware power states. This paper presents a software architecture that allows system designers to in- vestigate

Simunic, Tajana

254

Design of a Control Strategy for a Fuel Cell/Battery Hybrid Power Supply  

E-Print Network [OSTI]

The purpose of this thesis is to design hardware and a control strategy for a fuel cell/battery hybrid power supply. Modern fuel cell/battery hybrid power supplies can have 2 DC/DC converters: one converter for the battery and one for the fuel cell...

Smith, Richard C.

2010-01-14T23:59:59.000Z

255

PERFORMANCE OF DISTRIBUTED UTILITY-BASED POWER CONTROL FOR WIRELESS AD HOC NETWORKS  

E-Print Network [OSTI]

PERFORMANCE OF DISTRIBUTED UTILITY-BASED POWER CONTROL FOR WIRELESS AD HOC NETWORKS Jianwei Huang network. The users exchange prices that reflect their loss in utility due to interference. The prices are then used to determine optimal (utility maximizing) power levels for each user. We present simulation

Kuzmanovic, Aleksandar

256

Error Control Coding in Low-Power Wireless Sensor Networks: When is ECC  

E-Print Network [OSTI]

Error Control Coding in Low-Power Wireless Sensor Networks: When is ECC Energy-Efficient? Sheryl L. Interference is not considered; it would lower dCR. Analog decoders are shown to be the most energy-efficient at the decoder outweighs the transmitted power savings due to using ECC, then ECC would not be energy-efficient

Howard, Sheryl

257

Sliding Mode Power Control of Variable Speed Wind Energy Conversion Systems  

E-Print Network [OSTI]

Sliding Mode Power Control of Variable Speed Wind Energy Conversion Systems B. Beltran, T. Ahmed power generation in variable speed wind energy conversion systems (VS-WECS). These systems have two (National Renewable Energy Laboratory) wind turbine simulator FAST (Fatigue, Aerodynamics, Structures

Boyer, Edmond

258

Self-Optimization in Mobile Cellular Networks: Power Control and User Association  

E-Print Network [OSTI]

Self-Optimization in Mobile Cellular Networks: Power Control and User Association Chung Shue Chen develop mathematical and algorith- mic tools for the self-optimization of mobile cellular networks the wireless devices are proposed. We focus on the optimization of transmit power and of user association

Paris-Sud XI, Université de

259

Management of a Smart Grid with Controlled-Delivery of Discrete Power Levels  

E-Print Network [OSTI]

Management of a Smart Grid with Controlled-Delivery of Discrete Power Levels Roberto Rojas of Technology Newark, NJ 07102 {rojas, yx63, grebel}@njit.edu Abstract--The present electrical grid uses two to power amounts. These two properties, although functional and practical, expose the grid to overload

Rojas-Cessa, Roberto

260

Control of single-phase islanded PV/battery streetlight cluster based on Power-Line Signaling  

E-Print Network [OSTI]

1 Control of single-phase islanded PV/battery streetlight cluster based on Power-Line Signaling and low power (typically microturbines, PV and batteries). Power electronics provide the control of each unit, i.e. a converter fed by a battery. Energy management control is essential in order to handle

Vasquez, Juan Carlos

Note: This page contains sample records for the topic "rectifier power control" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


261

3484 IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS, VOL. 12, NO. 7, JULY 2013 Joint Back-Pressure Power Control and Interference  

E-Print Network [OSTI]

Gopalakrishnan and Nicholas D. Sidiropoulos, Fellow, IEEE Abstract--Back-Pressure Power Control (BPPC) is a cross control and interference cancellation are tightly coupled. This leads to a joint Back- Pressure Power, back- pressure, power control, interference cancellation, NP-hard, con- vex approximation. I

Sidiropoulos, Nikolaos D.

262

Power and Frequency Control as it Relates to Wind-Powered Generation  

E-Print Network [OSTI]

Undrill. 1975. "Automatic Generation Control", IEEE Tutorialfraction of generation providing response grid. The adjustment of generation, minute-by- minute, in

Lacommare, Kristina S H

2011-01-01T23:59:59.000Z

263

Control Strategies for Distributed Energy Resources to Maximize the Use of Wind Power in Rural Microgrids  

SciTech Connect (OSTI)

The focus of this paper is to design control strategies for distributed energy resources (DERs) to maximize the use of wind power in a rural microgrid. In such a system, it may be economical to harness wind power to reduce the consumption of fossil fuels for electricity production. In this work, we develop control strategies for DERs, including diesel generators, energy storage and demand response, to achieve high penetration of wind energy in a rural microgrid. Combinations of centralized (direct control) and decentralized (autonomous response) control strategies are investigated. Detailed dynamic models for a rural microgrid are built to conduct simulations. The system response to large disturbances and frequency regulation are tested. It is shown that optimal control coordination of DERs can be achieved to maintain system frequency while maximizing wind power usage and reducing the wear and tear on fossil fueled generators.

Lu, Shuai; Elizondo, Marcelo A.; Samaan, Nader A.; Kalsi, Karanjit; Mayhorn, Ebony T.; Diao, Ruisheng; Jin, Chunlian; Zhang, Yu

2011-10-10T23:59:59.000Z

264

OVERVIEW OF A RECONFIGURABLE SIMULATOR FOR MAIN CONTROL ROOM UPGRADES IN NUCLEAR POWER PLANTS  

SciTech Connect (OSTI)

This paper provides background on a reconfigurable control room simulator for nuclear power plants. The main control rooms in current nuclear power plants feature analog technology that is growing obsolete. The need to upgrade control rooms serves the practical need of maintainability as well as the opportunity to implement newer digital technologies with added functionality. There currently exists no dedicated research simulator for use in human factors design and evaluation activities for nuclear power plant modernization in the U.S. The new research simulator discussed in this paper provides a test bed in which operator performance on new control room concepts can be benchmarked against existing control rooms and in which new technologies can be validated for safety and usability prior to deployment.

Ronald L. Boring

2012-10-01T23:59:59.000Z

265

FRAMEWORK AND APPLICATION FOR MODELING CONTROL ROOM CREW PERFORMANCE AT NUCLEAR POWER PLANTS  

SciTech Connect (OSTI)

This paper summarizes an emerging project regarding the utilization of high-fidelity MIDAS simulations for visualizing and modeling control room crew performance at nuclear power plants. The key envisioned uses for MIDAS-based control room simulations are: (i) the estimation of human error associated with advanced control room equipment and configurations, (ii) the investigative determination of contributory cognitive factors for risk significant scenarios involving control room operating crews, and (iii) the certification of reduced staffing levels in advanced control rooms. It is proposed that MIDAS serves as a key component for the effective modeling of cognition, elements of situation awareness, and risk associated with human performance in next generation control rooms.

Ronald L Boring; David I Gertman; Tuan Q Tran; Brian F Gore

2008-09-01T23:59:59.000Z

266

Reference Model for Control and Automation Systems in Electrical Power  

Office of Environmental Management (EM)

AFDC Printable Version Share this resource Send a link to EERE: Alternative Fuels Data Center Home Page to someone by E-mail Share EERE: Alternative Fuels Data Center Home Page on Facebook Tweet about EERE: Alternative Fuels Data Center Home Page on Twitter Bookmark EERE:1 First Use of Energy for All Purposes (Fuel and Nonfuel),Feet) Year Jan Feb Mar Apr May Jun Jul(Summary) "of Energy Power.pdf11-161-LNG |September 15,2015 |Rebecca MatulkaDeliveryUpdatedRFI ReducingBurdenEPACT

267

Practical Control of Transmission Power for Wireless Sensor Networks  

E-Print Network [OSTI]

with online parameter estimation. P- TPC's robustness and energy savings are demonstrated through trace-driven simulations and real-world experiments in a campus building and residential environments. I. INTRODUCTION are four-fold. · A highly efficient feedback control algorithm that main- tains a desired link quality

Lu, Chenyang

268

Cooperative Congestion Control in Power Grid Communication Networks  

E-Print Network [OSTI]

for the delivery of Phasor Measurement Unit(PMU) [1] sensor data with real time guarantees to the control centers for timely decisions. Present day network systems are unable to ensure real-time needs of the PMU data for PMU data and to respond if transient deviations in real-time PMU network traffic occur. The frame

Nahrstedt, Klara

269

Shaping Power System Inter-area Oscillations through Control Loops of Grid Integrated Wind Farms  

E-Print Network [OSTI]

Shaping Power System Inter-area Oscillations through Control Loops of Grid Integrated Wind Farms. However, in many situations, it may not be possible to site a wind farm at the location with the most desirable frequency response. Here, we show that one can design a wind farm controller to shape

Gayme, Dennice

270

Control of a Fuel-Cell Powered DC Electric Vehicle Motor Federico Zenith  

E-Print Network [OSTI]

Control of a Fuel-Cell Powered DC Electric Vehicle Motor Federico Zenith Sigurd Skogestad Introduction Research in fuel cells receives currently a lot of interest. Fuel cells can be used, in different. However, the dynamics of fuel cells has received comparatively less attention. Control of fuel cells

Skogestad, Sigurd

271

Digitally Controlled Wide Range Pulse Width Modulator for On-Chip Power Supplies  

E-Print Network [OSTI]

of the inverters This research is supported in part by the New York State Office of Science, TechnologyDigitally Controlled Wide Range Pulse Width Modulator for On-Chip Power Supplies Selc¸uk K Rochester, New York 14627 fvaisband, friedmang@ece.rochester.edu Abstract-- A digitally controlled current

Friedman, Eby G.

272

Power and Frequency Control as it Relates to Wind-Powered Generation  

E-Print Network [OSTI]

pressure controller of a steam turbine. For the purpose ofthe response of steam turbines to governing action: R = 0.05cycle plants. The steam turbines of these plants are most

Lacommare, Kristina S H

2011-01-01T23:59:59.000Z

273

Stability, Power Sharing, & Distributed Secondary Control in Droop-Controlled Microgrids  

E-Print Network [OSTI]

. Simpson-Porco, Florian D¨orfler, Francesco Bullo Center for Control, Dynamical Systems and Computation

Bullo, Francesco

274

Control system and method for a power delivery system having a continuously variable ratio transmission  

DOE Patents [OSTI]

A control system and method for a power delivery system, such as in an automotive vehicle, having an engine coupled to a continuously variable ratio transmission (CVT). Totally independent control of engine and transmission enable the engine to precisely follow a desired operating characteristic, such as the ideal operating line for minimum fuel consumption. CVT ratio is controlled as a function of commanded power or torque and measured load, while engine fuel requirements (e.g., throttle position) are strictly a function of measured engine speed. Fuel requirements are therefore precisely adjusted in accordance with the ideal characteristic for any load placed on the engine.

Frank, Andrew A. (1034 Hillside Ave., Madison, WI 53705)

1984-01-01T23:59:59.000Z

275

Control system and method for a power delivery system having a continuously variable ratio transmission  

DOE Patents [OSTI]

A control system and method for a power delivery system, such as in an automotive vehicle, having an engine coupled to a continuously variable ratio transmission (CVT). Totally independent control of engine and transmission enable the engine to precisely follow a desired operating characteristic, such as the ideal operating line for minimum fuel consumption. CVT ratio is controlled as a function of commanded power or torque and measured load, while engine fuel requirements (e.g., throttle position) are strictly a function of measured engine speed. Fuel requirements are therefore precisely adjusted in accordance with the ideal characteristic for any load placed on the engine. 4 figs.

Frank, A.A.

1984-07-10T23:59:59.000Z

276

Load follow-up control of a pressurized water reactor power plant by using an approximate noninteractive control  

SciTech Connect (OSTI)

The present paper describes an attempt to apply an approximate noninteractive control to the load-following operation of the nuclear steam supply (NSS) system of a pressurized water reactor power plant. A control strategy is proposed for maximizing the unique merit of the noninteractive control in advancing the operational performance of the NSS system. An noninteractive load follow-up control system is designed based on the idea of approximate model-following. The authors make the design method more flexible and widely applicable to more general control problems by introducing some modifications. Digital simulations and graphical studies based on the Bode-diagram demonstrate the effectiveness of the noninteractive load follow-up control as well as the applicability of the proposed design method.

Tsuji, M.; Ogawa, Y.

1986-08-01T23:59:59.000Z

277

Power and Frequency Control as it Relates to Wind-Powered Generation  

E-Print Network [OSTI]

20. Typical simulated response of WECC system frequencies to38. Sample A – Response of WECC system frequency to loss ofP-C2A P-C2B RES1 RES2 VLD WECC Balancing area 1 Area Control

Lacommare, Kristina S H

2011-01-01T23:59:59.000Z

278

Diversity Strategies for Nuclear Power Plant Instrumentation and Control Systems  

SciTech Connect (OSTI)

This report presents the technical basis for establishing acceptable mitigating strategies that resolve diversity and defense-in-depth (D3) assessment findings and conform to U.S. Nuclear Regulatory Commission (NRC) requirements. The research approach employed to establish appropriate diversity strategies involves investigation of available documentation on D3 methods and experience from nuclear power and nonnuclear industries, capture of expert knowledge and lessons learned, determination of best practices, and assessment of the nature of common-cause failures (CCFs) and compensating diversity attributes. The research described in this report does not provide guidance on how to determine the need for diversity in a safety system to mitigate the consequences of potential CCFs. Rather, the scope of this report provides guidance to the staff and nuclear industry after a licensee or applicant has performed a D3 assessment per NUREG/CR-6303 and determined that diversity in a safety system is needed for mitigating the consequences of potential CCFs identified in the evaluation of the safety system design features. Succinctly, the purpose of the research described in this report was to answer the question, 'If diversity is required in a safety system to mitigate the consequences of potential CCFs, how much diversity is enough?' The principal results of this research effort have identified and developed diversity strategies, which consist of combinations of diversity attributes and their associated criteria. Technology, which corresponds to design diversity, is chosen as the principal system characteristic by which diversity criteria are grouped to form strategies. The rationale for this classification framework involves consideration of the profound impact that technology-focused design diversity provides. Consequently, the diversity usage classification scheme involves three families of strategies: (1) different technologies, (2) different approaches within the same technology, and (3) different architectures within the same technology. Using this convention, the first diversity usage family, designated Strategy A, is characterized by fundamentally diverse technologies. Strategy A at the system or platform level is illustrated by the example of analog and digital implementations. The second diversity usage family, designated Strategy B, is achieved through the use of distinctly different technologies. Strategy B can be described in terms of different digital technologies, such as the distinct approaches represented by general-purpose microprocessors and field-programmable gate arrays. The third diversity usage family, designated Strategy C, involves the use of variations within a technology. An example of Strategy C involves different digital architectures within the same technology, such as that provided by different microprocessors (e.g., Pentium and Power PC). The grouping of diversity criteria combinations according to Strategies A, B, and C establishes baseline diversity usage and facilitates a systematic organization of strategic approaches for coping with CCF vulnerabilities. Effectively, these baseline sets of diversity criteria constitute appropriate CCF mitigating strategies for digital safety systems. The strategies represent guidance on acceptable diversity usage and can be applied directly to ensure that CCF vulnerabilities identified through a D3 assessment have been adequately resolved. Additionally, a framework has been generated for capturing practices regarding diversity usage and a tool has been developed for the systematic assessment of the comparative effect of proposed diversity strategies (see Appendix A).

Wood, Richard Thomas [ORNL; Belles, Randy [ORNL; Cetiner, Mustafa Sacit [ORNL; Holcomb, David Eugene [ORNL; Korsah, Kofi [ORNL; Loebl, Andy [ORNL; Mays, Gary T [ORNL; Muhlheim, Michael David [ORNL; Mullens, James Allen [ORNL; Poore III, Willis P [ORNL; Qualls, A L [ORNL; Wilson, Thomas L [ORNL; Waterman, Michael E. [U.S. Nuclear Regulatory Commission

2010-02-01T23:59:59.000Z

279

A Microfluidic Rectifier: Anisotropic Flow Resistance at Low Reynolds Numbers Alex Groisman* and Stephen R. Quake  

E-Print Network [OSTI]

A Microfluidic Rectifier: Anisotropic Flow Resistance at Low Reynolds Numbers Alex Groisman are reversible. In microfluidic devices, where Re is essentially always low, this implies that flow resistance as a dynamic valve and may find applications in microfluidic pumps and other integrated devices. DOI: 10

Quake, Stephen R.

280

Mapping Complexity Sources in Nuclear Power Plant Domains Understanding the sources of complexity in advanced Nuclear Power Plant (NPP) control rooms and their  

E-Print Network [OSTI]

Mapping Complexity Sources in Nuclear Power Plant Domains Understanding the sources of complexity in advanced Nuclear Power Plant (NPP) control rooms and their effects on human reliability is critical of complexity leveraging network theory. INTRODUCTION The nuclear power industry in United States has declined

Cummings, Mary "Missy"

Note: This page contains sample records for the topic "rectifier power control" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


281

Magnet power supply control of the NSLS VUV and x-ray storage rings transfer lines  

SciTech Connect (OSTI)

The transfer lines for NSLS VUV and x-ray storage rings have been split. New power supplies have been incorporated with existing ones. The existing microprocessor system has been upgraded in order to control the additional functions. This system expands the input/output port of the microprocessor to an addressable serial/parallel link to each magnet power supply. The implementation of this system will be discussed.

Klein, J.D.; Ramamoorthy, S.; Singh, O.; Smith, J.D.

1985-01-01T23:59:59.000Z

282

Control scheme for power modulation of a free piston Stirling engine  

DOE Patents [OSTI]

The present invention relates to a control scheme for power modulation of a free-piston Stirling engine-linear alternator power generator system. The present invention includes connecting an autotransformer in series with a tuning capacitance between a linear alternator and a utility grid to maintain a constant displacement to piston stroke ratio and their relative phase angle over a wide range of operating conditions.

Dhar, Manmohan (Schenectady, NY)

1989-01-01T23:59:59.000Z

283

Power calculations D.A. Freedman December 2007 What is the power of a randomized controlled experiment? We assume there are n1 + n2  

E-Print Network [OSTI]

Power calculations D.A. Freedman December 2007 What is the power of a randomized controlled of the null against the alternative µ1 = µ2, and we compute power at µ1 = µ2 + k where k > 0 is chosen so is asymptotically distributed as N(k, 1), where k = k/f Suppose k > 2. If Z is N(0, 1), asymptotic power is then P

Sekhon, Jasjeet S.

284

Coal-fired power generation: Proven technologies and pollution control systems  

SciTech Connect (OSTI)

During the last two decades, significant advances have been made in the reduction of emissions from coal-fired power generating plants. New technologies include better understanding of the fundamentals of the formation and destruction of criteria pollutants in combustion processes (low nitrogen oxides burners) and improved methods for separating criteria pollutants from stack gases (FGD technology), as well as efficiency improvements in power plants (clean coal technologies). Future demand for more environmentally benign electric power, however, will lead to even more stringent controls of pollutants (sulphur dioxide and nitrogen oxides) and greenhouse gases such as carbon dioxide.

Balat, M. [University of Mah, Trabzon (Turkey)

2008-07-01T23:59:59.000Z

285

Supervisory Power Management Control Algorithms for Hybrid Electric Vehicles: A Survey  

SciTech Connect (OSTI)

The growing necessity for environmentally benign hybrid propulsion systems has led to the development of advanced power management control algorithms to maximize fuel economy and minimize pollutant emissions. This paper surveys the control algorithms for hybrid electric vehicles (HEVs) and plug-in HEVs (PHEVs) that have been reported in the literature to date. The exposition ranges from parallel, series, and power split HEVs and PHEVs and includes a classification of the algorithms in terms of their implementation and the chronological order of their appearance. Remaining challenges and potential future research directions are also discussed.

Malikopoulos, Andreas [ORNL

2014-01-01T23:59:59.000Z

286

Apparatus and method for closed-loop control of reactor power in minimum time  

DOE Patents [OSTI]

Closed-loop control law for altering the power level of nuclear reactors in a safe manner and without overshoot and in minimum time. Apparatus is provided for moving a fast-acting control element such as a control rod or a control drum for altering the nuclear reactor power level. A computer computes at short time intervals either the function: .rho.=(.beta.-.rho.).omega.-.lambda..sub.e '.rho.-.SIGMA..beta..sub.i (.lambda..sub.i -.lambda..sub.e ')+l* .omega.+l* [.omega..sup.2 +.lambda..sub.e '.omega.] or the function: .rho.=(.beta.-.rho.).omega.-.lambda..sub.e .rho.-(.lambda..sub.e /.lambda..sub.e)(.beta.-.rho.)+l* .omega.+l* [.omega..sup.2 +.lambda..sub.e .omega.-(.lambda..sub.e /.lambda..sub.e).omega.] These functions each specify the rate of change of reactivity that is necessary to achieve a specified rate of change of reactor power. The direction and speed of motion of the control element is altered so as to provide the rate of reactivity change calculated using either or both of these functions thereby resulting in the attainment of a new power level without overshoot and in minimum time. These functions are computed at intervals of approximately 0.01-1.0 seconds depending on the specific application.

Bernard, Jr., John A. (72 Paul Revere Rd., Needham Heights, MA 02194)

1988-11-01T23:59:59.000Z

287

Nonlinear power flow control applications to conventional generator swing equations subject to variable generation.  

SciTech Connect (OSTI)

In this paper, the swing equations for renewable generators are formulated as a natural Hamiltonian system with externally applied non-conservative forces. A two-step process referred to as Hamiltonian Surface Shaping and Power Flow Control (HSSPFC) is used to analyze and design feedback controllers for the renewable generator system. This formulation extends previous results on the analytical verification of the Potential Energy Boundary Surface (PEBS) method to nonlinear control analysis and design and justifies the decomposition of the system into conservative and non-conservative systems to enable a two-step, serial analysis and design procedure. In particular, this approach extends the work done by developing a formulation which applies to a larger set of Hamiltonian Systems that has Nearly Hamiltonian Systems as a subset. The results of this research include the determination of the required performance of a proposed Flexible AC Transmission System (FACTS)/storage device to enable the maximum power output of a wind turbine while meeting the power system constraints on frequency and phase. The FACTS/storage device is required to operate as both a generator and load (energy storage) on the power system in this design. The Second Law of Thermodynamics is applied to the power flow equations to determine the stability boundaries (limit cycles) of the renewable generator system and enable design of feedback controllers that meet stability requirements while maximizing the power generation and flow to the load. Necessary and sufficient conditions for stability of renewable generators systems are determined based on the concepts of Hamiltonian systems, power flow, exergy (the maximum work that can be extracted from an energy flow) rate, and entropy rate.

Robinett, Rush D., III; Wilson, David Gerald

2010-05-01T23:59:59.000Z

288

A Versatile and Powerful Simulator for Design, Advanced Control and Expert Systems  

E-Print Network [OSTI]

and powerful steady state simulator which has been satisfactorily applied to both on-line and off-line applications for plant utility and other process systems. Designated as MASSBAL MK II, the simulator has a unique architecture, menu/and or graphic... optimization Process synthesis Start-up,shut-down,on-line changes Training Debugging, trouble-shooting and monitoring Control Plantwide control, scheduling and Economic management [1] MASSBAL MK II was developed over a two-year period by SACDA...

Schindler, H. E.; Leaver, E. W.; Shewchuk, C. F.

289

A new coordinated control strategy for boiler-turbine system of coal-fired power plant  

SciTech Connect (OSTI)

This paper presents the new development of the boiler-turbine coordinated control strategy using fuzzy reasoning and autotuning techniques. The boiler-turbine system is a very complex process that is a multivariable, nonlinear, slowly time-varying plant with large settling time and a lot of uncertainties. As there exist strong couplings between the main steam pressure control loop and the power output control loop in the boiler-turbine unit with large time-delay and uncertainties, automatic coordinated control of the two loops is a very challenging problem. This paper presents a new coordinated control strategy (CCS) which is organized into two levels: a basic control level and a high supervision level. Proportional-integral derivative (PID) type controllers are used in the basic level to perform basic control functions while the decoupling between two control loops can be realized in the high level. A special subclass of fuzzy inference systems, called the Gaussian partition with evenly (GPE) spaced midpoints systems, is used to self-tune the main steam pressure PID controller's parameters online based on the error signal and its first difference, aimed at overcoming the uncertainties due to changing fuel calorific value, machine wear, contamination of the boiler heating surfaces and plant modeling errors. For the large variation of operating condition, a supervisory control level has been developed by autotuning technique. The developed CCS has been implemented in a power plant in China, and satisfactory industrial operation results demonstrate that the proposed control strategy has enhanced the adaptability and robustness of the process. Indeed, better control performance and economic benefit have been achieved.

Li, S.Y.; Liu, H.B.; Cai, W.J.; Soh, Y.C.; Xie, L.H. [Shanghai Jiao Tong University, Shanghai (China)

2005-11-01T23:59:59.000Z

290

Analysis of wind power for battery charging  

SciTech Connect (OSTI)

One type of wind-powered battery charging will be explored in this paper. It consists of a wind turbine driving a permanent magnet alternator and operates at variable speed. The alternator is connected to a battery bank via a rectifier. The characteristic of the system depends on the wind turbine, the alternator, and the system configuration. If the electrical load does not match the wind turbine, the performance of the system will be degraded. By matching the electrical load to the wind turbine, the system can be improved significantly. This paper analyzes the properties of the system components. The effects of parameter variation and the system configuration on the system performance are investigated. Two basic methods of shaping the torque-speed characteristic of the generator are presented. The uncompensated as well as the compensated systems will be discussed. Control strategies to improve the system performance will be explored. Finally, a summary of the paper will be presented in the last section.

Muljadi, E.; Drouilhet, S.; Holz, R. [National Renewable Energy Lab., Golden, CO (United States); Gevorgian, V. [University of Armenia, Yerevan (Armenia). State Engineering

1995-11-01T23:59:59.000Z

291

Load controller and method to enhance effective capacity of a photovoltaic power supply using a dynamically determined expected peak loading  

DOE Patents [OSTI]

A load controller and method are provided for maximizing effective capacity of a non-controllable, renewable power supply coupled to a variable electrical load also coupled to a conventional power grid. Effective capacity is enhanced by monitoring power output of the renewable supply and loading, and comparing the loading against the power output and a load adjustment threshold determined from an expected peak loading. A value for a load adjustment parameter is calculated by subtracting the renewable supply output and the load adjustment parameter from the current load. This value is then employed to control the variable load in an amount proportional to the value of the load control parameter when the parameter is within a predefined range. By so controlling the load, the effective capacity of the non-controllable, renewable power supply is increased without any attempt at operational feedback control of the renewable supply.

Perez, Richard

2005-05-03T23:59:59.000Z

292

Bias-field controlled phasing and power combination of gyromagnetic nonlinear transmission lines  

SciTech Connect (OSTI)

Gyromagnetic Nonlinear Transmission Lines (NLTLs) generate microwaves through the damped gyromagnetic precession of the magnetic moments in ferrimagnetic material, and are thus utilized as compact, solid-state, frequency agile, high power microwave (HPM) sources. The output frequency of a NLTL can be adjusted by control of the externally applied bias field and incident voltage pulse without physical alteration to the structure of the device. This property provides a frequency tuning capability not seen in many conventional e-beam based HPM sources. The NLTLs developed and tested are mesoband sources capable of generating MW power levels in the L, S, and C bands of the microwave spectrum. For an individual NLTL the output power at a given frequency is determined by several factors including the intrinsic properties of the ferrimagnetic material and the transmission line structure. Hence, if higher power levels are to be achieved, it is necessary to combine the outputs of multiple NLTLs. This can be accomplished in free space using antennas or in a transmission line via a power combiner. Using a bias-field controlled delay, a transient, high voltage, coaxial, three port, power combiner was designed and tested. Experimental results are compared with the results of a transient COMSOL simulation to evaluate combiner performance.

Reale, D. V., E-mail: david.reale@ttu.edu; Bragg, J.-W. B.; Gonsalves, N. R.; Johnson, J. M.; Neuber, A. A.; Dickens, J. C.; Mankowski, J. J. [Center for Pulsed Power and Power Electronics, Texas Tech University, Lubbock, Texas 79409 (United States)

2014-05-15T23:59:59.000Z

293

Particulate Control Device (PCD) Testing at the Power Systems Development Facility, Wilsonville, Alabama  

SciTech Connect (OSTI)

One of the U.S. Department of Energy`s (DOE`s) objectives overseen by the Morgantown Energy Technology Center (METC) is to test systems and components for advanced coal-based power generation systems, including integrated gasification combined cycle (IGCC), pressurized fluidized-bed combustion (PFBC), and integrated gasification/fuel cell (IGFC) systems. Stringent particulate requirements for fuel gas for both combustion turbines and fuel cells that are integral to these systems. Particulates erode and chemically attack the blade surfaces in turbines, and cause blinding of the electrodes in fuel cells. Filtration of the hot, high-pressure, gasified coal is required to protect these units. Filtration can be accomplished by first cooling the gas, but the system efficiency is reduced. High-temperature, high-pressure, particulate control devices (PCDs) need to be developed to achieve high efficiency and to extend the lifetime of downstream components to acceptable levels. Demonstration of practical high-temperature PCDs is crucial to the evolution of advanced, high-efficiency, coal-based power generation systems. The intent at the Power Systems Development Facility (PSDF) is to establish a flexible test facility that can be used to (1) develop advanced power system components, such as high-temperature, high-pressure PCDs; (2) evaluate advanced power system configurations and (3) assess the integration and control issues of these advanced power systems.

Longanbach, J.R.

1995-12-01T23:59:59.000Z

294

A STOCHASTIC OPTIMAL CONTROL APPROACH FOR POWER MANAGEMENT IN PLUG-IN HYBRID ELECTRIC VEHICLES  

E-Print Network [OSTI]

A STOCHASTIC OPTIMAL CONTROL APPROACH FOR POWER MANAGEMENT IN PLUG-IN HYBRID ELECTRIC VEHICLES.e., the engine and electric machines) in a plug-in hybrid electric vehicle (PHEV). Existing studies focus mostly. INTRODUCTION This paper examines plug-in hybrid electric vehicles (PHEVs), i.e., automobiles that can extract

Krstic, Miroslav

295

Using Variable-Range Transmission Power Control in Wireless Ad Hoc Networks  

E-Print Network [OSTI]

Using Variable-Range Transmission Power Control in Wireless Ad Hoc Networks Javier Gomez and Andrew networks such as ad hoc and sensor networks. First, using previous work by Steele [18], we show that in this paper highlight the need to design future MAC and routing protocols for wireless ad hoc and sensor

Gomez-Castellanos, Javier

296

Models for Impact Assessment of Wind-Based Power Generation on Frequency Control  

E-Print Network [OSTI]

the impact of different renewable penetration sce- narios on system frequency performance metrics. In order communication and control; new loads, such as plug-in hybrid electric vehicles (PHEV); advanced power- gration of new renewable-based electricity generation sources, e.g., wind and solar. Focusing on renewable

Liberzon, Daniel

297

On The Impact of Communication Delays on Power System Automatic Generation Control Performance  

E-Print Network [OSTI]

of the smart grid vision. Supervisory control and data acquisition (SCADA) systems, as computer network [2]. In this regard, reliable, secure, and low-latency communication network infrastructures in SCADA systems; the specifics of DNP3 for SCADA systems in electric power networks can be found in [3

Liberzon, Daniel

298

A Power Control Game with Smooth Reduction of SINR Objectives Omur Ozel Elif Uysal-Biyikoglu  

E-Print Network [OSTI]

, rather than not be provided any service at all. We propose a distributed utility based algorithm-based power control algorithms play an important role, as a natural method to generate a distributed algorithm to a linear price. We first provide conditions for a unique Nash equi- librium. Assuming that distributed

Uysal-Biyikoglu, Elif

299

On Setting up Energy-Efficient Paths with Transmitter Power Control  

E-Print Network [OSTI]

On Setting up Energy-Efficient Paths with Transmitter Power Control in Wireless Sensor Networks Science Simon Fraser University Vancouver, Canada Email: jcliu@cs.sfu.ca Abstract-- Energy-efficiency could find a more energy-efficient path to the sink. We provide an efficient approximation algorithm

Lyu, Michael R.

300

pahwa@ksu.edu Holonic Multi-agent Control of Power Distribution Systems of the Future  

E-Print Network [OSTI]

pahwa@ksu.edu Holonic Multi-agent Control of Power Distribution Systems of the Future A. PAHWA, S number of these devices. In this paper, we present a Holonic Multi-agent System Architecture capable, extensible, and secure cyber architecture based on holonic multi-agent principles to support adaptive PDS

Singh, Gurdip

Note: This page contains sample records for the topic "rectifier power control" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


301

A CMOS Low Power Biohybrid Lamprey Robot Controller Design Yong-Bin Kim  

E-Print Network [OSTI]

, industrial, and scientific applications for autonomous robots that can operate adaptively in unpredictable or dangerous work efforts ranging from industrial to field applications. There is a strong demand for consumerA CMOS Low Power Biohybrid Lamprey Robot Controller Design Yong-Bin Kim Department of Electrical

Ayers, Joseph

302

Driving Low-Power Wearable Systems with an Adaptively-Controlled Foot-Strike Scavenging Platform  

E-Print Network [OSTI]

as a means to scavenge energy from foot-strikes and power wearable systems. While they exhibit large energy densities, DEs must be closely controlled to maximize the energy they transduce. Towards this end, we propose a DE micro-generator array configuration that enhances transduc- tion efficiency, and the use

Potkonjak, Miodrag

303

Joint Power Control and Beamforming Codebook Design for MISO Channels under the Outage  

E-Print Network [OSTI]

Joint Power Control and Beamforming Codebook Design for MISO Channels under the Outage Criterion and beamforming codebooks for limited-feedback multiple-input single-output (MISO) wireless systems. The problem focuses on optimal design of single-user limited-feedback systems over multiple-input single-output (MISO

Yu, Wei

304

Joint Power Control and Beamforming Codebook Design for MISO Channels with Limited Feedback  

E-Print Network [OSTI]

Joint Power Control and Beamforming Codebook Design for MISO Channels with Limited Feedback Behrouz-input single-output (MISO) wireless systems with a rate-limited feedback link. The problem is cast in the form-output (MISO) channel with channel state information at the receiver (CSIR) and a noiseless delay-free feedback

Yu, Wei

305

Optimizing the Output of a Human-Powered Energy Harvesting System with Miniaturization and Integrated Control  

E-Print Network [OSTI]

1 Optimizing the Output of a Human-Powered Energy Harvesting System with Miniaturization mechanical energy from human foot-strikes and explore its configuration and control towards optimized energy output. Dielectric Elastomers (DEs) are high-energy density, soft, rubber-like material

Potkonjak, Miodrag

306

HVDC Control Strategies to Improve Transient Stability in Interconnected Power Systems  

E-Print Network [OSTI]

HVDC Control Strategies to Improve Transient Stability in Interconnected Power Systems J. Hazra Dpt of Li`ege, Belgium, dernst@ulg.ac.be Abstract--This paper presents three HVDC modulation strate- gies flow settings through the HVDC-links. The proposed techniques are tested on the IEEE 24-Bus reliability

Boyer, Edmond

307

Real-Time Wind Turbine Emulator Suitable for Power Quality and Dynamic Control Studies  

E-Print Network [OSTI]

1 Real-Time Wind Turbine Emulator Suitable for Power Quality and Dynamic Control Studies Dale S. L. Dolan, Student Member, IEEE, P. W. Lehn, Member IEEE Abstract-- Wind turbines are increasingly becoming-time Wind Turbine Emulator, which emulates the dynamic torque produced by an actual turbine has been

Lehn, Peter W.

308

Predictive Power Control of Doubly-Fed Induction Generator for Wave Energy Converters  

E-Print Network [OSTI]

energy resource plan. An extremely abundant and promising source of energy exists in oceans of the following categories: wave energy, marine and tidal current energy, ocean thermal energy, energy fromPredictive Power Control of Doubly-Fed Induction Generator for Wave Energy Converters M.S. Lagoun1

Paris-Sud XI, Université de

309

A Predictive power control of Doubly Fed Induction Generator for Wave Energy Converter  

E-Print Network [OSTI]

's excessive energy demand. An extremely abundant and promising source of energy exists in oceans. Currently be included in one of the following categories: wave energy, marine and tidal current energy, ocean thermalA Predictive power control of Doubly Fed Induction Generator for Wave Energy Converter in Irregular

Brest, Université de

310

Chance Constrained Optimal Power Flow: Risk-Aware Network Control under Uncertainty  

E-Print Network [OSTI]

When uncontrollable resources fluctuate, Optimum Power Flow (OPF), routinely used by the electric power industry to re-dispatch hourly controllable generation (coal, gas and hydro plants) over control areas of transmission networks, can result in grid instability, and, potentially, cascading outages. This risk arises because OPF dispatch is computed without awareness of major uncertainty, in particular fluctuations in renewable output. As a result, grid operation under OPF with renewable variability can lead to frequent conditions where power line flow ratings are significantly exceeded. Such a condition, which is borne by simulations of real grids, would likely resulting in automatic line tripping to protect lines from thermal stress, a risky and undesirable outcome which compromises stability. Smart grid goals include a commitment to large penetration of highly fluctuating renewables, thus calling to reconsider current practices, in particular the use of standard OPF. Our Chance Constrained (CC) OPF correct...

Bienstock, Daniel; Harnett, Sean

2012-01-01T23:59:59.000Z

311

Voltage/Pitch Control for Maximization and Regulation of Active/Reactive Powers in Wind Turbines with Uncertainties  

E-Print Network [OSTI]

This paper addresses the problem of controlling a variable-speed wind turbine with a Doubly Fed Induction Generator (DFIG), modeled as an electromechanically-coupled nonlinear system with rotor voltages and blade pitch angle as its inputs, active and reactive powers as its outputs, and most of the aerodynamic and mechanical parameters as its uncertainties. Using a blend of linear and nonlinear control strategies (including feedback linearization, pole placement, uncertainty estimation, and gradient-based potential function minimization) as well as time-scale separation in the dynamics, we develop a controller that is capable of maximizing the active power in the Maximum Power Tracking (MPT) mode, regulating the active power in the Power Regulation (PR) mode, seamlessly switching between the two modes, and simultaneously adjusting the reactive power to achieve a desired power factor. The controller consists of four cascaded components, uses realistic feedback signals, and operates without knowledge of the C_p-...

Guo, Yi; Jiang, John N; Tang, Choon Yik; Ramakumar, Rama G

2010-01-01T23:59:59.000Z

312

Modeling of boron control during power transients in a pressurized water reactor  

SciTech Connect (OSTI)

Accurate control instructions in a reactor control aid computer are included in order to realize the boron makeup throughput, which is required to obtain the boron concentration in the primary coolant loop, predicted by a neutronic code. A modeling of the transfer function between the makeup and the primary loop is proposed. The chemical and volumetric control system, the pressurizer, and the primary loop are modeled as instantaneous diffusion cells. The pipes are modeled as time lag lines. The model provides the unstationary boron distributions in the different elements of the setup. A numerical code is developed to calculate the time evolutions of the makeup throughput during power transients.

Mathieu, P.; Distexhe, E.

1986-02-01T23:59:59.000Z

313

The trend of digital control system design for nuclear power plants in Korea  

SciTech Connect (OSTI)

Currently there are 20 nuclear power plants (NPPs) in operation, and 6 more units are under construction in Korea. The control systems of those NPPs have also been developed together with the technology advancement. Control systems started with On-Off control using the relay logic, had been evolved into Solid-State logic using TTL ICs, and applied with the micro-processors since the Yonggwang NPP Units 3 and 4 which started its construction in 1989. Multiplexers are also installed at the local plant areas to collect field input and to send output signals while communicating with the controllers located in the system cabinets near the main control room in order to reduce the field wiring cables. The design of the digital control system technology for the NPPs in Korea has been optimized to maximize the operability as well as the safety through the design, construction, start-up and operation experiences. Both Shin-Kori Units 1 and 2 and Shin-Wolsong Units 1 and 2 NPP projects under construction are being progressed at the same time. Digital Plant Control Systems of these projects have adopted multi-loop controllers, redundant loop configuration, and soft control system for the radwaste system. Programmable Logic Controller (PLC) and Distributed Control System (DCS) are applied with soft control system in Shin-Kori Units 3 and 4. This paper describes the evolvement of control system at the NPPs in Korea and the experience and design improvement through the observation of the latest failure of the digital control system. In addition, design concept and its trend of the digital control system being applied to the NPP in Korea are introduced. (authors)

Park, S. H.; Jung, H. Y.; Yang, C. Y.; Choe, I. N. [Korea Power Engineering Company, 360-9 Mabuk-Dong, Yongin-Si, Gyeonggi-Do, 446-713 (Korea, Republic of)

2006-07-01T23:59:59.000Z

314

An expert system for voltage control in a power system network  

SciTech Connect (OSTI)

This paper presents a prototype of an expert system for alleviation of voltage violations in the day-to-day operation of large power networks. Voltage control for varying load and generation conditions can be achieved by co-ordinated control of switchable shunt VAR compensating (SVC) devices and On load transformer taps (OLTC), while generator excitations are used in dynamic control of voltage profile. This paper deals with the development of an expert system for voltage corrections for base case and contingency conditions using switchable shunt reactive compensation and transformer tap settings. The performance of the expert system is compared with the conventional optimization technique of voltage control and concurrent results have been obtained. The proposed expert system has been tested with simulated conditions of a few practical power systems. Results obtained for a 24 bus EHV Indian power network have been included for illustration purpose. The expert system is found to be suitable for on-line application in Energy Control Center as the solution is obtained very fast.

Bansilal; Thukaram, D.; Parthasarathy, K. [Indian Inst. of Science, Bangalore (India). Dept. of Electrical Engineering

1995-12-31T23:59:59.000Z

315

2004 35thAnnual IEEE Power Electronics SpecialistsConference Aachen, Germany. 2004 Digital Controller Design for Electronic Ballasts with Phase Control  

E-Print Network [OSTI]

2004 35thAnnual IEEE Power Electronics SpecialistsConference Aachen, Germany. 2004 Digital Controller Design for Electronic Ballasts with Phase Control Yan Yin and Regan Zane Colorado Power Electronics Center University of Colorado at Boulder Boulder, CO 80309-0425 yiny@colorado.edu, zane

316

Advance Three Phase Power Factor Correction Schemes for Utility Interface of Power Electronic Systems  

E-Print Network [OSTI]

systems, battery chargers and data centers etc. Also, high voltage DC (HVDC) systems employ rectifiers to convert ac input to DC output. HVDC is one example of the application of AC/DC conversion, in power system also, grid tie of two different power...

Albader, Mesaad

2014-07-30T23:59:59.000Z

317

Modeling of integrated environmental control systems for coal-fired power plants  

SciTech Connect (OSTI)

The Integrated Environmental Control Model (IECM) was designed to permit the systematic evaluation of environmental control options for pulverized coal-fired (PC) power plants. Of special interest was the ability to compare the performance and cost of advanced pollution control systems to conventional'' technologies for the control of particulate, SO{sub 2} and NO{sub x}. Of importance also was the ability to consider pre-combustion, combustion and post-combustion control methods employed alone or in combination to meet tough air pollution emission standards. Finally, the ability to conduct probabilistic analyses is a unique capability of the IECM. Key results are characterized as distribution functions rather than as single deterministic values. (VC)

Rubin, E.S.; Salmento, J.S.; Frey, H.C.; Abu-Baker, A.; Berkenpas, M.

1991-05-01T23:59:59.000Z

318

Modeling of integrated environmental control systems for coal-fired power plants. Final report  

SciTech Connect (OSTI)

The Integrated Environmental Control Model (IECM) was designed to permit the systematic evaluation of environmental control options for pulverized coal-fired (PC) power plants. Of special interest was the ability to compare the performance and cost of advanced pollution control systems to ``conventional`` technologies for the control of particulate, SO{sub 2} and NO{sub x}. Of importance also was the ability to consider pre-combustion, combustion and post-combustion control methods employed alone or in combination to meet tough air pollution emission standards. Finally, the ability to conduct probabilistic analyses is a unique capability of the IECM. Key results are characterized as distribution functions rather than as single deterministic values. (VC)

Rubin, E.S.; Salmento, J.S.; Frey, H.C.; Abu-Baker, A.; Berkenpas, M.

1991-05-01T23:59:59.000Z

319

Nonlinear power flow feedback control for improved stability and performance of airfoil sections  

DOE Patents [OSTI]

A computer-implemented method of determining the pitch stability of an airfoil system, comprising using a computer to numerically integrate a differential equation of motion that includes terms describing PID controller action. In one model, the differential equation characterizes the time-dependent response of the airfoil's pitch angle, .alpha.. The computer model calculates limit-cycles of the model, which represent the stability boundaries of the airfoil system. Once the stability boundary is known, feedback control can be implemented, by using, for example, a PID controller to control a feedback actuator. The method allows the PID controller gain constants, K.sub.I, K.sub.p, and K.sub.d, to be optimized. This permits operation closer to the stability boundaries, while preventing the physical apparatus from unintentionally crossing the stability boundaries. Operating closer to the stability boundaries permits greater power efficiencies to be extracted from the airfoil system.

Wilson, David G.; Robinett, III, Rush D.

2013-09-03T23:59:59.000Z

320

AbstractThis paper discusses issues of tuning, performance and interactions of PSS and FACTS controllers in a test power  

E-Print Network [OSTI]

controllers in a test power system. The controllers are placed in the system to control electromechanical at different loading levels for various cases are studied using the IEEE 14- bus test system. The effect. Finally, controller interaction studies are presented for the same test system. Section II introduces some

Cañizares, Claudio A.

Note: This page contains sample records for the topic "rectifier power control" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


321

Performance Analysis of Fully Joint Diversity Combining, Adaptive Modulation, and Power Control Schemes  

E-Print Network [OSTI]

), Helsinki, Finland, June 2001, pp. 570?574. [13] N. Belhaj, N. Hamdi, M.-S. Alouini, and A. Bouallegue, ?Low-power minimum estimation and combining with adaptive modulation,? in Proc. IEEE Int. Symp. on Signal Processing and Its Applications (ISSPA?05..., ?Diversity combining with up-link power control,? in Proc. IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, Helsinki, Finland, September 2006, pp. 1?5. [17] A. Gjendemsj?, H. C. Yang, G. E. ?ien, and M.-S. Alouini, ?Minimum...

Bouida, Zied

2010-01-14T23:59:59.000Z

322

We Need to Talk... Developing Communicating Power Supplies to Monitor & Control Miscellaneous Electric Loads  

SciTech Connect (OSTI)

Plug loads represent 30percent of total electricity use in residential buildings. Significant energy savings would result from an accurate understanding of which miscellaneous electric devices are using energy, at what time, and in what quantity. Commercially available plug load monitoring and control solutions replace or limit the attached device's native controls - forcing the user to adapt to a separate set of controls associated with the monitoring and control hardware. A better solution is integration of these capabilities at the power supply level. In this paper, we demonstrate a method achieving this integration. Our solution allows unobtrusive power monitoring and control while retaining native device control features. Further, our prototype enables intelligent behaviors by allowing devices to respond to the state of one another automatically. The CPS enables energy savings while demonstrating an added level of functionality to the user. If CPS technology became widespread in devices, a combination of automated and human interactive solutions would enable high levels of energy savings in buildings.

Weber, Andrew; Lanzisera, Steven; Liao, Anna; Meier, Alan

2014-08-11T23:59:59.000Z

323

812 IEEE TRANSACTIONS ON POWER DELIVERY, VOL. 16, NO. 4, OCTOBER 2001 A Robust Control Strategy for Shunt and Series  

E-Print Network [OSTI]

voltage is not effective in damping of power oscillations. To damp power Manuscript received July 23, 1997 for Shunt and Series Reactive Compensators to Damp Electromechanical Oscillations Mojtaba Noroozian, Senior stability are analyzed. A control strategy for damping of electromechanical power oscillations using

Hiskens, Ian A.

324

Abstract--By penetrating the SCADA system, an intruder may remotely operate a power system using supervisory control  

E-Print Network [OSTI]

1 Abstract-- By penetrating the SCADA system, an intruder may remotely operate a power system using vulnerability using attack trees. The attack tree formulation based on power system control networks is used to evaluate the system, scenario, and leaf vulnerabilities. The measure of vulnerabilities in the power system

Manimaran, Govindarasu

325

1068 IEEE TRANSACTIONS ON POWER ELECTRONICS, VOL. 25, NO. 4, APRIL 2010 Modeling and Control Design for a Very  

E-Print Network [OSTI]

- generative decentralized sources and the continuous replacement of overhead power lines by subterraneous decentralized sources and the continuous re- placement of overhead power lines by subterraneous distribu- tion1068 IEEE TRANSACTIONS ON POWER ELECTRONICS, VOL. 25, NO. 4, APRIL 2010 Modeling and Control Design

Paderborn, Universität

326

Bulk Power Systems Dynamics and Control -IV Restructuring, Santorini, Greece, August 1998 IS MODAL RESONANCE A PRECURSOR TO  

E-Print Network [OSTI]

Bulk Power Systems Dynamics and Control - IV Restructuring, Santorini, Greece, August 1998 IS MODAL RESONANCE A PRECURSOR TO POWER SYSTEM OSCILLATIONS? Ian Dobson Jianfeng Zhang Scott Greene Henrik Engdahl Peter W. Sauer POWER SYSTEMS ENGINEERING RESEARCH CENTER Electrical and Computer Engineering Department

327

Direct power control of shunt active filter using high selectivity filter (HSF) under distorted or unbalanced conditions  

E-Print Network [OSTI]

.A. Djaffar) Abstract This paper describes the design of a new configuration of direct power control (DPC inverter voltage vector in order to minimize instantaneous active and reactive power errors using two powers by selecting the optimal switching states of the inverter. Simulation results have proved

Paris-Sud XI, Université de

328

Extended Constant Power Speed Range of the Brushless DC Motor Through Dual Mode Inverter Control  

SciTech Connect (OSTI)

The trapezoidal back electromotive force (emf) brushless direct current (dc) motor (BDCM) with surface-mounted magnets has high-power density and efficiency especially when rare-earth magnet materials are used. Traction applications, such as electric vehicles, could benefit significantly from the use of such motors. Unfortunately, a practical means for driving the motor over a constant power speed ratio (CPSR) of 5:1 or more has not yet been developed. A key feature of these motors is that they have low internal inductance. The phase advance method is effective in controlling the motor power over such a speed range, but the current at high speed may be several times greater than that required at the base speed. The increase in current during high-speed operation is due to the low motor inductance and the action of the bypass diodes of the inverter. The use of such a control would require increased current rating of the inverter semiconductors and additional cooling for the inverter, where the conduction losses increase proportionally with current, and especially for the motor, where the losses increase with the square of the current. The high current problems of phase advance can be mitigated by adding series inductance; however, this reduces power density, requires significant increase in supply voltage, and leaves the CPSR performance of the system highly sensitive to variations in the available voltage. A new inverter topology and control scheme has been developed that can drive low-inductance BDCMs over the CPSR that would be required in electric vehicle applications. This new controller is called the dual-mode inverter control (DMIC). It is shown that the BDCM has an infinite CPSR when it is driven by the DMIC.

Lawler, J.S.

2000-06-23T23:59:59.000Z

329

718 IEEE TRANSACTIONS ON CONTROL SYSTEMS TECHNOLOGY, VOL. 9, NO. 5, SEPTEMBER 2001 Reactive Power and Unbalance Compensation Using  

E-Print Network [OSTI]

718 IEEE TRANSACTIONS ON CONTROL SYSTEMS TECHNOLOGY, VOL. 9, NO. 5, SEPTEMBER 2001 Reactive Power as reactive power and unbalance compensators, e.g., Static synchronous compensator (STATCOM). The approach practice. Index Terms--Active filters, adaptive control, dissipative sys- tems, nonlinear systems, reactive

Stankoviæ, Aleksandar

330

Abstract--This paper proposes an optimization based method of planning reactive power control for electric transmission  

E-Print Network [OSTI]

1 Abstract--This paper proposes an optimization based method of planning reactive power control for electric transmission systems to endow them with the capability of being reconfigured to a secure planning, reactive power control, reconfiguration, voltage stability. I. INTRODUCTION PPROPRIATE long

Kumar, Ratnesh

331

Active control of the resistive wall mode with power saturation Li Li, Yue Liu, and Yueqiang Liu  

E-Print Network [OSTI]

Active control of the resistive wall mode with power saturation Li Li, Yue Liu, and Yueqiang Liu://pop.aip.org/about/rights_and_permissions #12;Active control of the resistive wall mode with power saturation Li Li,1,a) Yue Liu,1 and Yueqiang, 116024, People's Republic of China 2 Euratom/CCFE Fusion Association, Culham Science Centre, Abingdon OX

332

248 IEEE TRANSACTIONS ON POWER DELIVERY, VOL. 17, NO. 1, JANUARY 2002 Modeling, Analysis, and Control of a Current Source  

E-Print Network [OSTI]

--This paper presents a new approach for the dy- namic control of a current source inverter (CSI)-based STATic-commutated inverters to achieve advanced reactive power control have been confirmed by many researchers [1248 IEEE TRANSACTIONS ON POWER DELIVERY, VOL. 17, NO. 1, JANUARY 2002 Modeling, Analysis

Lehn, Peter W.

333

System using a megawatt class millimeter wave source and a high-power rectenna to beam power to a suspended platform  

DOE Patents [OSTI]

A system for beaming power to a high altitude platform is based upon a high power millimeter gyrotron source, optical transmission components, and a high-power receiving antenna (i.e., a rectenna) capable of rectifying received millimeter energy and converting such energy into useable electrical power.

Caplan, Malcolm; Friedman, Herbert W.

2005-07-19T23:59:59.000Z

334

Cost effective designs for integrating new electronic turbine control systems into existing steam power plants  

SciTech Connect (OSTI)

Different cost-effective approaches have been developed for integrating new digital turbine control systems into existing power plants. The devices under consideration range from self contained actuators which replace the existing hydraulic and mechanical servomotor components, linear proportional actuators, which mechanically drive the original servomotor pilot relays, to electro-hydraulic converters which provide a control pressure to the existing hydraulic servomotor pilot relays. These devices significantly reduce the implementation cost, while still providing most of the benefits that can be gained through greater utilization of the new electronic control capabilities. These three design approaches are analyzed for control performance, failure modes, long-term maintenance issues, and applicability to specific turbine configurations.

Nguyen, T.V. [Westinghouse Electric Corp., Orlando, FL (United States)

1996-10-01T23:59:59.000Z

335

Review of Methods Related to Assessing Human Performance in Nuclear Power Plant Control Room Simulations  

SciTech Connect (OSTI)

With the increased use of digital systems in Nuclear Power Plant (NPP) control rooms comes a need to thoroughly understand the human performance issues associated with digital systems. A common way to evaluate human performance is to test operators and crews in NPP control room simulators. However, it is often challenging to characterize human performance in meaningful ways when measuring performance in NPP control room simulations. A review of the literature in NPP simulator studies reveals a variety of ways to measure human performance in NPP control room simulations including direct observation, automated computer logging, recordings from physiological equipment, self-report techniques, protocol analysis and structured debriefs, and application of model-based evaluation. These methods and the particular measures used are summarized and evaluated.

Katya L Le Blanc; Ronald L Boring; David I Gertman

2001-11-01T23:59:59.000Z

336

Photovoltaic power converter system with a controller configured to actively compensate load harmonics  

DOE Patents [OSTI]

Photovoltaic power converter system including a controller configured to reduce load harmonics is provided. The system comprises a photovoltaic array and an inverter electrically coupled to the array to generate an output current for energizing a load connected to the inverter and to a mains grid supply voltage. The system further comprises a controller including a first circuit coupled to receive a load current to measure a harmonic current in the load current. The controller includes a second circuit to generate a fundamental reference drawn by the load. The controller further includes a third circuit for combining the measured harmonic current and the fundamental reference to generate a command output signal for generating the output current for energizing the load connected to the inverter. The photovoltaic system may be configured to compensate harmonic currents that may be drawn by the load.

de Rooij, Michael Andrew (Clifton Park, NY); Steigerwald, Robert Louis (Burnt Hills, NY); Delgado, Eladio Clemente (Burnt Hills, NY)

2008-12-16T23:59:59.000Z

337

Assessment of H/sub 2/S control technologies for geothermal power plants  

SciTech Connect (OSTI)

Techniques for controlling hydrogen sulfide (H/sub 2/S) from geothermal development are analyzed. Several technologies for controlling H/sub 2/S emissions from power plants are examined. The Hydrogen Peroxide Combination System, Stretford System and possibly EIC or Coury upstream controls appear capable of compliance with the emission limitations of 100 grams per hour per gross megawatt in 1980 (and 50 q/hr/(g) MW in 1985 or 1990) at the Geysers Dry stream field in Northern California. Unresolved problems still plague all these options. Well field operations result in H/sub 2/S releases from well drilling, well venting and steam stacking. Hydrogen peroxide reduces H/sub 2/S emissions during drilling and venting can be controlled with vent gathering (condensation/reinjection) systems. Steam stacking during power plant outages emit more H/sub 2/S over shorter periods than other field operations. Potential controls for stacking are: (1) upstream abatement, (2) automated well operation, (3) computerized wellfield operation (as of PG and E's Geysers Unit No. 15), and (4) further steamfield interconnection (cross-overs).

Not Available

1980-02-01T23:59:59.000Z

338

Power Smoothing and Limitation Control of a PMSG-Based Marine Current Turbine under Swell Waves  

E-Print Network [OSTI]

Power Smoothing and Limitation Control of a PMSG-Based Marine Current Turbine under Swell Waves la puissance maximale (MPPT) nécessiterait d'accélérer ou de décélérer fréquemment la turbine à par une turbine marine associée à un générateur synchrone à aimants permanents (GSAP). Un algorithme

Boyer, Edmond

339

140 IEEE TRANSACTIONS ON CONTROL SYSTEMS TECHNOLOGY, VOL. 9, NO. 1, JANUARY 2001 Fuzzy Damage-Mitigating Control of a Fossil Power  

E-Print Network [OSTI]

-data controller tracks a reference trajectory vector while the upper tier contains a fuzzy-logic-based damage140 IEEE TRANSACTIONS ON CONTROL SYSTEMS TECHNOLOGY, VOL. 9, NO. 1, JANUARY 2001 Fuzzy Damage of real-time fuzzy damage-mitigating control in fossil power plants, and the results show that substantial

Ray, Asok

340

1462 IEEE TRANSACTIONS ON POWER SYSTEMS, VOL. 26, NO. 3, AUGUST 2011 A Self-Organizing Strategy for Power Flow Control  

E-Print Network [OSTI]

con- trol algorithm that will regulate the power output of multiple pho- tovoltaic generators (PVs) in a distribution network. To this end, the cooperative control methodology from network control theory is used-00267-2010. H. Xin is with the Department of Electrical Engineering, Zhejiang University, Hangzhou

Qu, Zhihua

Note: This page contains sample records for the topic "rectifier power control" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


341

Semiconductor systems utilizing materials that form rectifying junctions in both N and P-type doping regions, whether metallurgically or field induced, and methods of use  

DOE Patents [OSTI]

Disclosed are semiconductor systems, such as integrated circuits utilizing Schotky barrier and/or diffused junction technology, which semiconductor systems incorporate material(s) that form rectifying junctions in both metallurgically and/or field induced N and P-type doping regions, and methods of their use. Disclosed are Schottky barrier based inverting and non-inverting gate voltage channel induced semiconductor single devices with operating characteristics similar to multiple device CMOS systems and which can be operated as modulators, N and P-channel MOSFETS and CMOS formed therefrom, and (MOS) gate voltage controlled rectification direction and gate voltage controlled switching devices, and use of such material(s) to block parasitic current flow pathways. Simple demonstrative five mask fabrication procedures for inverting and non-inverting gate voltage channel induced semiconductor single devices with operating characteristics similar to multiple device CMOS systems are also presented.

Welch, James D. (10328 Pinehurst Ave., Omaha, NE 68124)

2000-01-01T23:59:59.000Z

342

Applying Human Factors Evaluation and Design Guidance to a Nuclear Power Plant Digital Control System  

SciTech Connect (OSTI)

The United States (U.S.) nuclear industry, like similar process control industries, has moved toward upgrading its control rooms. The upgraded control rooms typically feature digital control system (DCS) displays embedded in the panels. These displays gather information from the system and represent that information on a single display surface. In this manner, the DCS combines many previously separate analog indicators and controls into a single digital display, whereby the operators can toggle between multiple windows to monitor and control different aspects of the plant. The design of the DCS depends on the function of the system it monitors, but revolves around presenting the information most germane to an operator at any point in time. DCSs require a carefully designed human system interface. This report centers on redesigning existing DCS displays for an example chemical volume control system (CVCS) at a U.S. nuclear power plant. The crucial nature of the CVCS, which controls coolant levels and boration in the primary system, requires a thorough human factors evaluation of its supporting DCS. The initial digital controls being developed for the DCSs tend to directly mimic the former analog controls. There are, however, unique operator interactions with a digital vs. analog interface, and the differences have not always been carefully factored in the translation of an analog interface to a replacement DCS. To ensure safety, efficiency, and usability of the emerging DCSs, a human factors usability evaluation was conducted on a CVCS DCS currently being used and refined at an existing U.S. nuclear power plant. Subject matter experts from process control engineering, software development, and human factors evaluated the DCS displays to document potential usability issues and propose design recommendations. The evaluation yielded 167 potential usability issues with the DCS. These issues should not be considered operator performance problems but rather opportunities identified by experts to improve upon the design of the DCS. A set of nine design recommendations was developed to address these potential issues. The design principles addressed the following areas: (1) color, (2) pop-up window structure, (3) navigation, (4) alarms, (5) process control diagram, (6) gestalt grouping, (7) typography, (8) terminology, and (9) data entry. Visuals illustrating the improved DCS displays accompany the design recommendations. These nine design principles serve as the starting point to a planned general DCS style guide that can be used across the U.S. nuclear industry to aid in the future design of effective DCS interfaces.

Thomas Ulrich; Ronald Boring; William Phoenix; Emily Dehority; Tim Whiting; Jonathan Morrell; Rhett Backstrom

2012-08-01T23:59:59.000Z

343

Robust Implementation of Distributed Algorithms for Control of Distributed Energy Resources  

E-Print Network [OSTI]

peak-shaving during hours of high demand and load leveling at night [5]. Proper coordination.g., photovoltaic (PV) systems or motor drives with active rectifier inputs) to provide reactive power support

Liberzon, Daniel

344

IEEE TRANSACTIONS ON POWER ELECTRONICS, VOL. 23, NO. 1, JANUARY 2008 11 Electronic Ballast Control IC With Digital Phase  

E-Print Network [OSTI]

IEEE TRANSACTIONS ON POWER ELECTRONICS, VOL. 23, NO. 1, JANUARY 2008 11 Electronic Ballast Control ballast controller fabricated in a 0.8 CMOS process used in a 400 W, 150 kHz HID electronic ballast. Index Terms--Current regulation, digital control, electronic bal- last, integrated circuit, over voltage

345

Using System Dynamics to Define, Study, and Implement Smart Control Strategies on the Electric Power Grid  

SciTech Connect (OSTI)

The United States electric power grid is the most complex and expansive control system in the world. Local generation control occurs at individual units based on response time and unit economics, larger regional control coordinates unit response to error conditions, and high level large-area regional control is ultimately administered by a network of humans guided by economic and resiliency related factors. Under normal operating conditions, the grid is a relatively slow moving entity that exhibits high inertia to outside stimuli, and behaves along repeatable diurnal and seasonal patterns. However, that paradigm is quickly changing because of the increasing implementation of renewable generation sources. Renewable generators by nature cannot be tightly controlled or scheduled. They appear like a negative load to the system with all of the variability associated with load on a larger scale. Also, grid-reactive loads (i.e. smart devices) can alter their consumption based on price or demand rules adding more variability to system behavior. This paper demonstrates how a systems dynamic modeling approach capable of operating over multiple time scales, can provide valuable insight into developing new “smart-grid” control strategies and devices needed to accommodate renewable generation and regulate the frequency of the grid.

Lyle G. Roybal; Robert F Jeffers

2013-07-01T23:59:59.000Z

346

Method of installing a control room console in a nuclear power plant  

DOE Patents [OSTI]

An advanced control room complex for a nuclear power plant, including a discrete indicator and alarm system (72) which is nuclear qualified for rapid response to changes in plant parameters and a component control system (64) which together provide a discrete monitoring and control capability at a panel (14-22, 26, 28) in the control room (10). A separate data processing system (70), which need not be nuclear qualified, provides integrated and overview information to the control room and to each panel, through CRTs (84) and a large, overhead integrated process status overview board (24). The discrete indicator and alarm system (72) and the data processing system (70) receive inputs from common plant sensors and validate the sensor outputs to arrive at a representative value of the parameter for use by the operator during both normal and accident conditions, thereby avoiding the need for him to assimilate data from each sensor individually. The integrated process status board (24) is at the apex of an information hierarchy that extends through four levels and provides access at each panel to the full display hierarchy. The control room panels are preferably of a modular construction, permitting the definition of inputs and outputs, the man machine interface, and the plant specific algorithms, to proceed in parallel with the fabrication of the panels, the installation of the equipment and the generic testing thereof.

Scarola, Kenneth (Windsor, CT); Jamison, David S. (Windsor, CT); Manazir, Richard M. (North Canton, CT); Rescorl, Robert L. (Vernon, CT); Harmon, Daryl L. (Enfield, CT)

1994-01-01T23:59:59.000Z

347

Stability effects of frequency controllers and transmission line configurations on power systems with integration of wind power  

E-Print Network [OSTI]

This thesis investigates the stability effects of the integration of wind power on multi-machine power systems. First, the small-signal stability effects of turbine governors connected to synchronous generators in the ...

Abdelhalim, Hussein Mohamed

2012-01-01T23:59:59.000Z

348

A knowledge-based system for control of xenon-induced spatial power oscillations during load-follow operations  

SciTech Connect (OSTI)

As is well known, large pressurized water reactors (PWRs) are subject to xenon-induced axial power oscillations at some time during a given cycle. Attention to this behavior is required during load-follow operations. A knowledge-based system for controlling xenon-induced spatial power oscillations is described. Experience with a limited set of load-follow patterns has demonstrated that the system is capable of providing advice on appropriate control actions. A simulation model, coupled with a rule-learning process, has been found to be a useful way for determining appropriate weights for the rules that relate power patterns and control actions.

Chung, Sun-Kyo; Danofsky, R.A.; Spinrad, B.I.

1988-01-01T23:59:59.000Z

349

Length sensing and control of a Michelson interferometer with Power Recycling and Twin Signal Recycling cavities  

E-Print Network [OSTI]

The techniques of power recycling and signal recycling have proven as key concepts to increase the sensitivity of large-scale gravitational wave detectors by independent resonant enhancement of light power and signal sidebands within the interferometer. Developing the latter concept further, twin signal recycling was proposed as an alternative to conventional detuned signal recycling. Twin signal recycling features the narrow-band sensitivity gain of conventional detuned signal recycling but furthermore facilitates the injection of squeezed states of light, increases the detector sensitivity over a wide frequency band and requires a less complex detection scheme for optimal signal readout. These benefits come at the expense of an additional recycling mirror, thus increasing the number of degrees of freedom in the interferometer which need to be controlled. In this article we describe the development of a length sensing and control scheme and its successful application to a tabletop-scale power recycled Michelson interferometer with twin signal recycling. We were able to lock the interferometer in all relevant longitudinal degrees of freedom, enabling the long-term stable operation of the experiment. We thus laid the foundation for further investigations of this interferometer topology to evaluate its viability for the application in gravitational wave detectors.

Christian Gräf; André Thüring; Henning Vahlbruch; Karsten Danzmann; Roman Schnabel

2012-11-29T23:59:59.000Z

350

CERN-PS Main Power Converter Renovation How to Provide and Control the Large Flow of Energy for a Rapid Cyclic Machine?  

E-Print Network [OSTI]

The PS accelerator (Proton-Synchrotron) at CERN, which is part of the LHC injector chain, is composed of one hundred magnets connected in series. During a typical acceleration cycle (taking 2.4 seconds), the active power at the magnet terminals varies from plus to minus 40 MW. As this large active power variation was not acceptable to the electrical network, a motor-generator set (M-G) was inserted between the grid and the load. The M-G set (of 1968) acts as a fly-wheel with a stored kinetic energy of 233 MJ and the magnets are fed via two 12-pulse thyristor rectifiers. A renovation or replacement of the installation is planned in the near future as part of the consolidation of the LHC injectors to avoid any major breakdown, to improve overall availability and to reduce operation and maintenance costs. This paper presents a first comparison of technical solutions available to build such a power system and the strategy that will be applied for the up-grade of the system.

Bordry, Frederick; Völker, F V

2005-01-01T23:59:59.000Z

351

Distributed control of reactive power flow in a radial distribution circuit with high photovoltaic penetration  

SciTech Connect (OSTI)

We show how distributed control of reactive power can serve to regulate voltage and minimize resistive losses in a distribution circuit that includes a significant level of photovoltaic (PV) generation. To demonstrate the technique, we consider a radial distribution circuit with a single branch consisting of sequentially-arranged residential-scale loads that consume both real and reactive power. In parallel, some loads also have PV generation capability. We postulate that the inverters associated with each PV system are also capable of limited reactive power generation or consumption, and we seek to find the optimal dispatch of each inverter's reactive power to both maintain the voltage within an acceptable range and minimize the resistive losses over the entire circuit. We assume the complex impedance of the distribution circuit links and the instantaneous load and PV generation at each load are known. We compare the results of the optimal dispatch with a suboptimal local scheme that does not require any communication. On our model distribution circuit, we illustrate the feasibility of high levels of PV penetration and a significant (20% or higher) reduction in losses.

Chertkov, Michael [Los Alamos National Laboratory; Turitsyn, Konstantin [Los Alamos National Laboratory; Backhaus, Scott [Los Alamos National Laboratory; Sule, Petr [NEW MEXICO CONSORTIUM

2009-01-01T23:59:59.000Z

352

IntroductiontoPowerSuppliesAN-556 National Semiconductor  

E-Print Network [OSTI]

TL G 10061 IntroductiontoPowerSuppliesAN-556 National Semiconductor Application Note 556 Ralph E ripple voltage to capacitor C1 The bridge rectifier circuit has a simple transformer but current must in a full-wave bridge for the same input voltage TL G 10061­1 FIGURE 1 Idealized Power Supply TL G 10061

Paderborn, Universität

353

Control system design for maintaining CO{sub 2} capture in IGCC power plants while loading-following  

SciTech Connect (OSTI)

Load-following requirements for future integrated gasification combined cycle (IGCC) power plants with precombustion CO{sub 2} capture are expected to be far more challenging as electricity produced by renewable energy is connected to the grid and strict environmental limits become mandatory requirements. In this work, loadfollowing studies are performed using a comprehensive dynamic model of an IGCC plant with pre-combustion CO{sub 2} capture developed in Aspen Engineering Suite (AES). Considering multiple single-loop controllers for power demand load following, the preferred IGCC control strategy from the perspective of a power producer is gas turbine (GT) lead with gasifier follow. In this strategy, the GT controls the load by manipulating its firing rate while the slurry feed flow to the gasifier is manipulated to control the syngas pressure at the GT inlet. The syngas pressure control is an integrating process with significant time delay mainly because of the large piping and equipment volumes between the gasifier and the GT inlet. A modified proportional–integral–derivative (PID) control is considered for IGCC syngas pressure control. The desired CO{sub 2} capture rate must be maintained while the IGCC plant follows the load. For maintaining the desired CO{sub 2} capture rate, the control performance of PID control is compared with linear model predictive control (LMPC). The results show that the LMPC outperforms PID control for maintaining CO{sub 2} capture rates in an IGCC power plant while load following.

Bhattacharyya, D.; Turton, R.; Zitney, S.

2012-01-01T23:59:59.000Z

354

AC Resonant charger with charge rate unrelated to primary power frequency  

DOE Patents [OSTI]

An AC resonant charger for a capacitive load, such as a PFN, is provided with a variable repetition rate unrelated to the frequency of a multi-phase AC power source by using a control unit to select and couple the phase of the power source to the resonant charger in order to charge the capacitive load with a phase that is the next to begin a half cycle. For optimum range in repetition rate and increased charging voltage, the resonant charger includes a step-up transformer and full-wave rectifier. The next phase selected may then be of either polarity, but is always selected to be of a polarity opposite the polarity of the last phase selected so that the transformer core does not saturate. Thyristors are used to select and couple the correct phase just after its zero crossover in response to a sharp pulse generated by a zero-crossover detector. The thyristor that is turned on then automatically turns off after a full half cycle of its associated phase input. A full-wave rectifier couples the secondary winding of the transformer to the load so that the load capacitance is always charged with the same polarity.

Watson, Harold (Torrance, CA)

1982-01-01T23:59:59.000Z

355

The design of a controllable energy recovery device for solar powered reverse osmosis desalination with experimental validation  

E-Print Network [OSTI]

The purpose of this thesis is to design and validate a controllable energy recovery device with application to photovoltaic powered reverse osmosis (PVRO). The energy consumption of a reverse osmosis plant depends significantly ...

Reed, Elizabeth Anne, S.M. Massachusetts Institute of Technology

2012-01-01T23:59:59.000Z

356

Power system applications engineering intern experience at TRW Controls: an internship report  

E-Print Network [OSTI]

nifica nt project involved generator dynamics mode ll in g for Hydro and BWR Nuc lear g ener at or s in a Dis pa tcher Tr ai ning S im ul ator and the other was the ge neratio n of software mo dules to validate data cards for a Hydro Electric... for the degree of DOCTOR OF ENG INEERING August 1984 Major Subject: Electrical Engineering POWER SYSTEM APPLICATIONS ENGINEERING INTERN EXPERIENCE AT TRW CONTROLS An Internship Report by CHANDRAKU MA R JOHN BALACHANDRA Approved as to style and content by...

Balachandra, Chandrakumar John

2013-03-13T23:59:59.000Z

357

Joint Routing, Scheduling And Power Control For Multihop Wireless Networks With Multiple Antennas  

E-Print Network [OSTI]

We consider the problem of Joint Routing, Scheduling and Power-control (JRSP) problem for multihop wireless networks (MHWN) with multiple antennas. We extend the problem and a (sub-optimal) heuristic solution method for JRSP in MHWN with single antennas. We present an iterative scheme to calculate link capacities(achievable rates) in the interference environment of the network using SINR model. We then present the algorithm for solving the JRSP problem. This completes a feasible system model for MHWN when nodes have multiple antennas. We show that the gain we achieve by using multiple antennas in the network is linear both in optimal performance as well as heuristic algorithmic performance.

Vangala, Harish; Sharma, Prof Vinod

2011-01-01T23:59:59.000Z

358

Improvement of low speed induction generator performances and reducing the power of excitation and voltage control system  

SciTech Connect (OSTI)

In this paper we present the results of our investigations concerning the utilization of induction generators at very low speed. It is shown that, by proper design, it is possible to obtain high efficiency and high power factor values. The optimized induction generators require lower reactive power resulting in lower size and price of the excitation control system. 4 refs., 2 figs.

Budisan, N. [Politechnica Univ. of Timisoara (Romania); Hentea, T.; Mahil, S. [Purdue Univ. Calumet, Hammond, IN (United States); Madescu, G. [Romanian Academy, Timisoara (Romania)

1996-12-31T23:59:59.000Z

359

Dynamic Control of Electricity Cost with Power Demand Smoothing and Peak Shaving for Distributed Internet Data Centers  

E-Print Network [OSTI]

Dynamic Control of Electricity Cost with Power Demand Smoothing and Peak Shaving for Distributed a major part of their running costs. Modern electric power grid provides a feasible way to dynamically and efficiently manage the electricity cost of distributed IDCs based on the Locational Marginal Pricing (LMP

Rahman, A.K.M. Ashikur

360

1028 IEEE TRANSACTIONS ON POWER ELECTRONICS, VOL. 14, NO. 6, NOVEMBER 1999 Discrete Time Modeling and Control of  

E-Print Network [OSTI]

S 0885-8993(99)08907-3. and high-power inverter applications. Consequently, improved dynamics1028 IEEE TRANSACTIONS ON POWER ELECTRONICS, VOL. 14, NO. 6, NOVEMBER 1999 Discrete Time Modeling Abstract--A new voltage source converter control approach is presented, based on multivariable z

Lehn, Peter W.

Note: This page contains sample records for the topic "rectifier power control" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


361

Nitrogen Isotopic Composition of Coal-Fired Power Plant NOx: Influence of Emission Controls and Implications for Global Emission  

E-Print Network [OSTI]

Nitrogen Isotopic Composition of Coal-Fired Power Plant NOx: Influence of Emission Controls from coal-fired power plants in the U.S. at typical operating conditions with and without the presence this, a novel method for collection and isotopic analysis of coal-fired stack NOx emission samples

Elliott, Emily M.

362

Examining System-Wide Impacts of Solar PV Control Systems with a Power Hardware-in-the-Loop Platform  

SciTech Connect (OSTI)

High penetration levels of distributed solar PV power generation can lead to adverse power quality impacts such as excessive voltage rise, voltage flicker, and reactive power values that result in unacceptable voltage levels. Advanced inverter control schemes have been proposed that have the potential to mitigate many power quality concerns. However, closed-loop control may lead to unintended behavior in deployed systems as complex interactions can occur between numerous operating devices. In order to enable the study of the performance of advanced control schemes in a detailed distribution system environment, a Hardware-in-the-Loop (HIL) platform has been developed. In the HIL system, GridLAB-D, a distribution system simulation tool, runs in real-time mode at the Pacific Northwest National Laboratory (PNNL) and supplies power system parameters at a point of common coupling to hardware located at the National Renewable Energy Laboratory (NREL). Hardware inverters interact with grid and PV simulators emulating an operational distribution system and power output from the inverters is measured and sent to PNNL to update the real-time distribution system simulation. The platform is described and initial test cases are presented. The platform is used to study the system-wide impacts and the interactions of controls applied to inverters that are integrated into a simulation of the IEEE 8500-node test feeder, with inverters in either constant power factor control or active volt/VAR control. We demonstrate that this HIL platform is well-suited to the study of advanced inverter controls and their impacts on the power quality of a distribution feeder. Additionally, the results from HIL are used to validate GridLAB-D simulations of advanced inverter controls. ?

Williams, Tess L.; Fuller, Jason C.; Schneider, Kevin P.; Palmintier, Bryan; Lundstrom, Blake; Chakraborty, Sudipta

2014-10-11T23:59:59.000Z

363

Advanced intelligent coordinated control of coal fired power plant based on fuzzy reasoning and auto-tuning  

SciTech Connect (OSTI)

The load following operation of coal-fired boiler-turbine unit in power plants can lead to changes in operating points, and it results in nonlinear variations of the plant variables and parameters. As there exist strong couplings between the main steam pressure control loop and the power output control loop in the boiler-turbine unit with large time-delay and uncertainties, automatic coordinated control of the two loops is a very challenging problem. This paper presents a new coordinated control strategy (CCS) which is organized into two levels: a basic control level and a high supervision level. PID-type controllers are used in the basic level to perform basic control functions while the decoupling between two control loops can be realized in the high level. Moreover, PID-type controllers can be auto-tuned to achieve a better control performance in the whole operating range and to reject the unmeasurable disturbances. A special subclass of fuzzy inference systems, namely the Gaussian partition system with evenly spaced midpoints, is also proposed to auto-tune the PID controller in the main steam pressure loop based on the error signal and its first difference to overcome uncertainties caused by changing fuel calorific value, machine wear, contamination of the boiler heating surfaces and plant modeling errors, etc. The developed CCS has been implemented in a power plant in China, and satisfactory industrial operation results demonstrate that the proposed control strategy has enhanced the adaptability and robustness of the process.

Li, S.Y.; Liu, H.B.; Cai, W.J.; Soh, Y.C.; Xie, L.H. [Shanghai Jiao Tong University, Shanghai (China)

2004-07-01T23:59:59.000Z

364

Digital control systems in nuclear power plants: Failure information, modeling concepts, and applications. Revision 1  

SciTech Connect (OSTI)

This report briefly describes some current applications of advanced computerized digital display and control systems at US commercial nuclear power plants and presents the results of a literature search that was made to gather information on the reliability of these systems. Both hardware and software reliability were addressed in this review. Only limited failure rate information was found, with the chemical process industry being the primary source of information on hardware failure rates and expert opinion the primary source for software failure rates. Safety-grade digital control systems are typically installed on a functional like-for-like basis, replacing older analog systems without substantially changing interactions with other plant systems. Future work includes performing a limited probabilistic risk assessment of a representative DCS to assess its risk significance.

Galyean, W.J.

1993-06-23T23:59:59.000Z

365

Digital control systems in nuclear power plants: Failure information, modeling concepts, and applications  

SciTech Connect (OSTI)

This report briefly describes some current applications of advanced computerized digital display and control systems at US commercial nuclear power plants and presents the results of a literature search that was made to gather information on the reliability of these systems. Both hardware and software reliability were addressed in this review. Only limited failure rate information was found, with the chemical process industry being the primary source of information on hardware failure rates and expert opinion the primary source for software failure rates. Safety-grade digital control systems are typically installed on a functional like-for-like basis, replacing older analog systems without substantially changing interactions with other plant systems. Future work includes performing a limited probabilistic risk assessment of a representative DCS to assess its risk significance.

Galyean, W.J.

1993-06-23T23:59:59.000Z

366

Load controller and method to enhance effective capacity of a photovotaic power supply using a dynamically determined expected peak loading  

DOE Patents [OSTI]

A load controller and method are provided for maximizing effective capacity of a non-controllable, renewable power supply coupled to a variable electrical load also coupled to a conventional power grid. Effective capacity is enhanced by monitoring power output of the renewable supply and loading, and comparing the loading against the power output and a load adjustment threshold determined from an expected peak loading. A value for a load adjustment parameter is calculated by subtracting the renewable supply output and the load adjustment parameter from the current load. This value is then employed to control the variable load in an amount proportional to the value of the load control parameter when the parameter is within a predefined range. By so controlling the load, the effective capacity of the non-controllable, renewable power supply is increased without any attempt at operational feedback control of the renewable supply. The expected peak loading of the variable load can be dynamically determined within a defined time interval with reference to variations in the variable load.

Perez, Richard (Delmar, NY)

2003-04-01T23:59:59.000Z

367

The Use of Power Sums to Solve the Harmonic Elimination Equations for Multilevel Converters EPE Journal Vol. 15 no  

E-Print Network [OSTI]

sources (solar cells, fuel cells, the rectified output of wind turbines) to an existing ac power grid of solar cells are dc voltages, and if this energy is to be fed to into an ac power grid, a powerThe Use of Power Sums to Solve the Harmonic Elimination Equations for Multilevel Converters EPE

Tolbert, Leon M.

368

A control system for improved battery utilization in a PV-powered peak-shaving system  

SciTech Connect (OSTI)

Photovoltaic (PV) power systems offer the prospect of allowing a utility company to meet part of the daily peak system load using a renewable resource. Unfortunately, some utilities have peak system- load periods that do not match the peak production hours of a PV system. Adding a battery energy storage system to a grid-connected PV power system will allow dispatching the stored solar energy to the grid at the desired times. Batteries, however, pose system limitations in terms of energy efficiency, maintenance, and cycle life. A new control system has been developed, based on available PV equipment and a data acquisition system, that seeks to minimize the limitations imposed by the battery system while maximizing the use of PV energy. Maintenance requirements for the flooded batteries are reduced, cycle life is maximized, and the battery is operated over an efficient range of states of charge. This paper presents design details and initial performance results on one of the first installed control systems of this type.

Palomino, E [Salt River Project, Phoenix, AZ (United States); Stevens, J. [Sandia National Labs., Albuquerque, NM (United States); Wiles, J. [New Mexico State Univ., Las Cruces, NM (United States). Southwest Technology Development Inst.

1996-08-01T23:59:59.000Z

369

Abstract--Digital control is a powerful modern design technique and important research topic in power electronics, and  

E-Print Network [OSTI]

in power electronics, and it is useful to have a simple but flexible platform for experimentation a very diverse range of devices can be easily implemented by using a graphical user interface (GUI. SYSTEM ARCHITECTURE A. Overview An FPGA is a fast and powerful logic device that can be programmed

370

ACEEE Int. J. on Electrical and Power Engineering, Vol. 02, No. 01, Feb 2011 2011 ACEEE  

E-Print Network [OSTI]

.IJEPE.02.01.25 Simulation Studies of Shunt Passive Harmonic Filters: Six Pulse Rectifier Load Power support, i.e., the reactive power support required to arrest the voltage drop on loss of a plant generator- speed drive(ASD) systems [2], which may form a considerable percentage of overall plant load. When power

Paris-Sud XI, Université de

371

IEEE POWER ELECTRONICS LETTERS, VOL. 2, NO. 2, JUNE 2004 51 Digital Phase Control for Resonant Inverters  

E-Print Network [OSTI]

. In this letter, we present and verify a new concept for direct digital phase control of resonant invertersIEEE POWER ELECTRONICS LETTERS, VOL. 2, NO. 2, JUNE 2004 51 Digital Phase Control for Resonant Inverters Yan Yin, Student Member, IEEE, and Regan Zane, Member, IEEE Abstract--This letter presents

372

IEEE TRANSACTIONS ON POWER ELECTRONICS, VOL. 12, NO. 1, JANUARY 1997 87 Fuzzy Logic Based Intelligent Control of a Variable  

E-Print Network [OSTI]

system. The generation system has fuzzy logic control with vector control in the inner loops. A fuzzyIEEE TRANSACTIONS ON POWER ELECTRONICS, VOL. 12, NO. 1, JANUARY 1997 87 Fuzzy Logic Based a variable speed wind genera- tion system where fuzzy logic principles are used for efficiency optimization

Simões, Marcelo Godoy

373

Study of Power Converter Topologies with Energy Recovery and grid power flow control. Part A: 2-quadrant converter with energy storage.  

E-Print Network [OSTI]

In the framework of a Transfer line (TT2) Consolidation Programme, a number of studies on Energy cycling have been commissioned. Part of this work involves the study of different power electronic system topologies for magnet energy recovery [1{5]. In this report, the use of a two-quadrant (2Q) regulator connected to the DC link of a 4-quadrant magnet supply is analysed. The key objective of the study is to find control strategies that result in the control of the peak power required from the power network as well as to recover the magnet energy into capacitor banks with controlled voltage fluctuation. The study comprises the modelling of the system by means of the method of state averaging and the development of regulation strategies to energy management. The proposed control strategies can be divided in two groups: in the first group, the magnet current is used to dene the reference for the control system, while in the second group this current is considered as a perturbation and some strategies are devised ...

Maestri, S; Uicich, G; Benedetti, M; Le Godec, G; Papastergiou, K

2015-01-01T23:59:59.000Z

374

THE SYSTEM OF POWER SUPPLIES, CONTROL AND MODULATION OF ELECTRON GUN FOR FREE ELECTRON LASER  

E-Print Network [OSTI]

end components: GaN JFET transistors, 1GHz fiber optic link and RF micro strip transformers. The output of power inverter is connected to input coil of isolated power transformer (300kV). Timer Electric power for part 2 goes from power inverter through isolated power transformer (isolation voltage

Kozak, Victor R.

375

VOLUME 89, NUMBER 1 P H Y S I C A L R E V I E W L E T T E R S 1 JULY 2002 Mesoscopic Rectifiers Based on Ballistic Transport  

E-Print Network [OSTI]

rectifier with an optimized rectifying signal and predicts voltage oscillations which may provide it predicts a reversal and even oscillations of the trans- verse voltage, which may provide a test have exhibited an amazing rectifying effect in the transverse current-voltage characteristics

Timme, Marc

376

Electric Power Research Institute, Environmental Control Technology Center report to the Steering Committee. Final technical report  

SciTech Connect (OSTI)

Operations and maintenance continued this month at the Electric Power Research Institute`s Environmental Control Technology Center. Testing on the 4.0 MW Pilot Wet FGD unit continued this month with the Trace Element Removal (TER) test block, and a simultaneous testing of the Lime Forced Oxidation process with DBA addition (LDG). At the end of the month, a series of Duct Injection tests began in a study to determine the efficiencies of alkaline injection for removing trace elements (mercury). On the Cold-Side Selective Catalytic Reduction (SCR) unit, low temperature performance testing continued this month as measurements were taken for NO{sub x} removal efficiency, residual ammonia slip, and SO{sub 3} generation across the catalysts installed in the SCR reactor. This report describes the status of the facilities and test activities at the pilot and mini-pilot plants.

NONE

1995-07-01T23:59:59.000Z

377

Electric Power Research Institute Environmental Control Technology Center Report to the Steering Committee  

SciTech Connect (OSTI)

Operations and maintenance continued this month at the Electric Power Research Institute's (EPRI?s) Environmental Control Technology Center (ECTC). Testing for the month involved the Dry Sorbent Injection (DSI) test block with the Carbon Injection System. Also, several installation activities were initiated this month for the testing of a new EPRI/ADA Technologies sorbent sampling system in December. The 1.0 MW Cold-Side Selective Catalytic Reduction (SCR) unit, the 0.4 MW Mini Pilot Wet Scrubber, and the 4.0 MW Pilot Wet Scrubber remained idle this month in a cold-standby mode and were inspected regularly. These units remain available for testing as future work is identified.

None

1997-11-01T23:59:59.000Z

378

Microminiaturized minimally invasive intravascular micro-mechanical systems powered and controlled via fiber-optic cable  

DOE Patents [OSTI]

A micro-mechanical system for medical procedures is constructed in the basic form of a catheter having a distal end for insertion into and manipulation within a body and a near end providing for a user to control the manipulation of the distal end within the body. A fiberoptic cable is disposed within the catheter and having a distal end proximate to the distal end of the catheter and a near end for external coupling of laser light energy. A microgripper is attached to the distal end of the catheter and providing for the gripping or releasing of an object within the body. A laser-light-to-mechanical-power converter is connected to receive laser light from the distal end of the fiberoptic cable and connected to mechanically actuate the microgripper.

Fitch, Joseph P. (Livermore, CA); Hagans, Karla (Livermore, CA); Clough, Robert (Danville, CA); Matthews, Dennis L. (Moss Beach, CA); Lee, Abraham P. (Walnut Creek, CA); Krulevitch, Peter A. (Los Altos, CA); Benett, William J. (Livermore, CA); Da Silva, Luiz (Danville, CA); Celliers, Peter M. (Berkeley, CA)

1998-01-01T23:59:59.000Z

379

System and method for controlling power consumption in a computer system based on user satisfaction  

DOE Patents [OSTI]

Systems and methods for controlling power consumption in a computer system. For each of a plurality of interactive applications, the method changes a frequency at which a processor of the computer system runs, receives an indication of user satisfaction, determines a relationship between the changed frequency and the user satisfaction of the interactive application, and stores the determined relationship information. The determined relationship can distinguish between different users and different interactive applications. A frequency may be selected from the discrete frequencies at which the processor of the computer system runs based on the determined relationship information for a particular user and a particular interactive application running on the processor of the computer system. The processor may be adapted to run at the selected frequency.

Yang, Lei; Dick, Robert P; Chen, Xi; Memik, Gokhan; Dinda, Peter A; Shy, Alex; Ozisikyilmaz, Berkin; Mallik, Arindam; Choudhary, Alok

2014-04-22T23:59:59.000Z

380

Electric Power Research Institute: Environmental control technology. Final technical monthly report  

SciTech Connect (OSTI)

Operations and maintenance continued this month at the Electric Power Research Institute`s Environmental Control Technology Center. Testing on the 4.0 MW Pilot Wet FGD unit continued this month with the Trace Element Removal (TER) test block. A second phase of the lime Forced Oxidation process with DBA addition (LDG) was also conducted simultaneously on the Pilot System this month. This month the ECTC was off-line from 6/9 through 6/19 to complete a Facility retrofit project. During this brief outage, modifications were made to the ECTC Flue Gas Handling System to enhance the facility capabilities, and to prepare for future High Velocity Wet FGD Testing. On the Cold-Side Selective Catalytic Reduction (SCR) unit, the low temperature performance testing resumed this month as measurements were taken for NO{sub x} removal efficiency, residual ammonia slip, and SO{sub 3} generation across the new SCR catalysts.

NONE

1995-06-01T23:59:59.000Z

Note: This page contains sample records for the topic "rectifier power control" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


381

Power Control and Optimization of Photovoltaic and Wind Energy Conversion Systems /  

E-Print Network [OSTI]

be realized by capturing wind power at altitudes over the2011. [2] ——, “High altitude wind power systems: A survey onOckels, “Optimal cross-wind towing and power generation with

Ghaffari, Azad

2013-01-01T23:59:59.000Z

382

Mechanical sampling systems for coal quality control in Romanian power plants  

SciTech Connect (OSTI)

According to ISO 1988 samples must be taken from moving currents by using certain mechanical devices, and, only, exceptionally, by an understanding between party`s, by manually sampling. The principal requirements when designing and constructing a mechanical sampling system are that: it shall be capable of collecting and preparing increments or samples, as the case may be, that are free from relevant bias; it shall maintain this capability under all such conditions of sampling that are stipulated in the relevant specifications and without necessitating that sampling be interrupted for cleaning or maintenance. Actually, coal quality control in Romanian power plants are usually performed by a manual system. In order to meet ISO 1988 requirements, RENEL-GSCI (formerly ICEMENERG) has designed and achieved a falling stream sampler with cutter bucket in accordance with ISO 9411-1 (solid mineral fuels - Mechanical sampling from moving stream) provisions. This device has been installed in the Oradea 2 cogeneration power plant in the coal falling stream at the end of the belt conveyor. When the mechanical sampling installation was commissioned, experiments to check for precision and bias had been out for the installation as a whole. The method of checking for bias was by comparison with stopped-belt sampling. The mechanical sampling device is still under testing. The paper presents the result obtained during the preliminary test period in order to certify the mechanical sampler.

Matei, M. [Romanian Electricity Authority, Bucharest (Romania). Study, Research and Engineering Group

1998-12-31T23:59:59.000Z

383

Medical devices utilizing optical fibers for simultaneous power, communications and control  

DOE Patents [OSTI]

A medical device is constructed in the basic form of a catheter having a distal end for insertion into and manipulation within a body and a proximal end providing for a user to control the manipulation of the distal end within the body. A fiberoptic cable is disposed within the catheter and having a distal end proximate to the distal end of the catheter and a proximal end for external coupling of laser light energy. A laser-light-to-mechanical-power converter is connected to receive light from the distal end of the fiber optic cable and may include a photo-voltaic cell and an electromechanical motor or a heat-sensitive photo-thermal material. An electronic sensor is connected to receive electrical power from said distal end of the fiberoptic cable and is connected to provide signal information about a particular physical environment and communicated externally through the fiberoptic cable to the proximal end thereof. A mechanical sensor is attached to the distal end of the fiberoptic cable and connected to provide light signal information about a particular physical environment and communicated externally through the fiberoptic cable.

Fitch, Joseph P.; Matthews, Dennis L.; Hagans, Karla G.; Lee, Abraham P.; Krulevitch, Peter; Benett, William J.; Clough, Robert E.; DaSilva, Luiz B.; Celliers, Peter M.

2003-06-10T23:59:59.000Z

384

Electric Power Research Institute Environmental Control Technology Center: Report to the Steering Committee, June 1996  

SciTech Connect (OSTI)

Operations and maintenance continued this month at the Electric Power Research Institute`s (EPRI`s) Environmental Control Technology Center (ECTC). Testing for the Hazardous Air Pollutant (HAP) test block was conducted using the 4.0 MW Spray Dryer Absorber System (SDA) and Pulse Jet Fabric Filter (PJFF) - Carbon Injection System. Investigations also continued across the B&W/CHX Heat Exchanger unit, while the 1.0 MW Selective Catalytic Reduction (SCR) unit remained idle this month in a cold-standby mode as monthly inspections were conducted. Pilot Testing Highlights Testing efforts in June were focused on the HAP test block and the Trace Elements Removal (TER) test block. Both programs were conducted on the 4.0 MW wet FGD pilot unit and PJFF unit. The HAP test block was temporarily concluded in June to further review the test data. This program began in March as part of the DOE Advanced Power Systems Program; the mission of this program is to accelerate the commercialization of affordable, high-efficiency, low-emission, coal-fueled electric generating technologies. The 1996 HAP test block focuses on three research areas, including: Catalytic oxidation of vapor-phase elemental mercury; Enhanced particulate-phase HAPs removal by electrostatic charging of liquid droplets; and Enhanced mercury removal by addition of additives to FGD process liquor. The TER test block is part of EPRI`s overall program to develop control technology options for reduction of trace element emissions. This experimental program investigates mercury removal and mercury speciation under different operating conditions.

NONE

1996-06-01T23:59:59.000Z

385

Bulk Power System Dynamics and Control V, August 26-31, 2001, Onomichi, Japan Inverse Problems in Power Systems  

E-Print Network [OSTI]

within power electronic circuits. On the other hand, event-driven discrete behaviour is nor- mally or a FACTS device encounters its maxi- mum/minimum firing angle. To illustrate continuous the fault and decide on the appropriate response. Trip signals are sent to circuit breakers, which

Hiskens, Ian A.

386

A New Wind Turbine Control Method to Smooth Power Generation. Modelling and Comparison to Wind Turbine Frequency Control.  

E-Print Network [OSTI]

??Following the significant increase of world wide installed wind power during the first decade of the 21st century, transmission system operators are faced with new… (more)

Solberg, Olov

2012-01-01T23:59:59.000Z

387

Sensing system for detection and control of deposition on pendant tubes in recovery and power boilers  

DOE Patents [OSTI]

A system for detection and control of deposition on pendant tubes in recovery and power boilers includes one or more deposit monitoring sensors operating in infrared regions of about 4 or 8.7 microns and directly producing images of the interior of the boiler, or producing feeding signals to a data processing system for information to enable a distributed control system by which the boilers are operated to operate said boilers more efficiently. The data processing system includes an image pre-processing circuit in which a 2-D image formed by the video data input is captured, and includes a low pass filter for performing noise filtering of said video input. It also includes an image compensation system for array compensation to correct for pixel variation and dead cells, etc., and for correcting geometric distortion. An image segmentation module receives a cleaned image from the image pre-processing circuit for separating the image of the recovery boiler interior into background, pendant tubes, and deposition. It also accomplishes thresholding/clustering on gray scale/texture and makes morphological transforms to smooth regions, and identifies regions by connected components. An image-understanding unit receives a segmented image sent from the image segmentation module and matches derived regions to a 3-D model of said boiler. It derives a 3-D structure the deposition on pendant tubes in the boiler and provides the information about deposits to the plant distributed control system for more efficient operation of the plant pendant tube cleaning and operating systems.

Kychakoff, George (Maple Valley, WA); Afromowitz, Martin A. (Mercer Island, WA); Hogle, Richard E. (Olympia, WA)

2008-10-14T23:59:59.000Z

388

LQ Optimal Control of Wind Turbines in Hybrid Power Systems N.A. Cutululis1  

E-Print Network [OSTI]

taken into account for the design of a wind ­ diesel power system is the wind power penetration, which electrical load. However, the penetration of wind power into small diesel-based grids is limited because variations is well suited for operating in small wind ­ diesel power systems. The antagonistic demands

389

Low Cost Power and Supply Noise Estimation and Control in Scan Testing of VLSI Circuits  

E-Print Network [OSTI]

. To achieve constant test power, first, we built a fast and accurate power model, which can estimate the shift power without logic simulation of the circuit. We also proposed an efficient and low power X-bit Filling process, which could potentially reduce both...

Jiang, Zhongwei

2012-02-14T23:59:59.000Z

390

Power to the people: personal control in offices for thermal comfort and energy savings  

E-Print Network [OSTI]

Personal Control Devices .of Testing Personal Control Devices There have been severalstudies on such personal control devices is that the lab

Taub, Mallory L

2013-01-01T23:59:59.000Z

391

Bulk Power System Dynamics and Control -VI, August 22-27, 2004, Cortina D'Ampezzo, Italy Prediction of Instability Points Using System  

E-Print Network [OSTI]

on actual measured signals such as generator rotor speed, angle or power through the lines. Prony method, develop equivalent linear models of power systems, and tuning controllers using system measurement [12

Cañizares, Claudio A.

392

The intermountain power project commissioning - Subsynchronous torsional interaction tests  

SciTech Connect (OSTI)

Subsyncronous torsional vibration as a result of electrochemical interaction between the HVDC controls and a turbine-generator was first discovered during the commissioning of the Square Butte Project in 1977. The level of interaction between the HVDC controls and the turbine-generator depends on several interacting factors: the characteristic torsional frequencies of the turbine-generator, the bandwidth of the HVDC controls and the relative strength of the connecting ac system. For the Intermountain Power Project (IPP), early analysis of these interacting factors indicated that there exist definite potential for subsynchronous oscillation to occur. The calculated torsional frequencies of the IPP units showed that the first mode frequency is 14.0 Hz and is within the typical bandwidth of an HVDC control which is between 10-20 Hz. The HVDC controls, therefore, can influence the torsional stability of the IPP units. Further, the IPP turbine-generators are required to operate isolated on the HVDC rectifier terminal, with no other interconnecting ac network. This ''radial'' mode of operation will result in maximum interaction between the converter station and the IPP units. It became obvious that special measure must be implemented in the design of the IPP HVDC control system to modify its typical characteristics to avoid the occurrence of the subsynchronous oscillation. This paper presents the results of the subsynchronous torsional interaction (SSTI) tests that were performed during the commissioning of the IPP Unit 1 and the HVDC Transmission system.

Wu, C.T.; Peterson, K.J. (Dept. of Water and Power, Los Angeles, CA (US)); Pinko, R.J.; Kankam, M.D.; Baker, D.H. (General Electric Co., Schenectady, NY (US))

1988-10-01T23:59:59.000Z

393

Formulation and experimental evaluation of closed-form control laws for the rapid maneuvering of reactor neutronic power  

SciTech Connect (OSTI)

This report describes both the theoretical development and the experimental evaluation of a novel, robust methodology for the time-optimal adjustment of a reactor's neutronic power under conditions of closed-loop digital control. Central to the approach are the MIT-SNL Period-Generated Minimum Time Control Laws' which determine the rate at which reactivity should be changed in order to cause a reactor's neutronic power to conform to a specified trajectory. Using these laws, reactor power can be safely raised by five to seven orders of magnitude in a few seconds. The MIT-SNL laws were developed to facilitate rapid increases of neutronic power on spacecraft reactors operating in an SDI environment. However, these laws are generic and have other applications including the rapid recovery of research and test reactors subsequent to an unanticipated shutdown, power increases following the achievement of criticality on commercial reactors, power adjustments on commercial reactors so as to minimize thermal stress, and automated startups. The work reported here was performed by the Massachusetts Institute of Technology under contract to the Sandia National Laboratories. Support was also provided by the US Department of Energy's Division of University and Industry Programs. The work described in this report is significant in that a novel solution to the problem of time-optimal control of neutronic power was identified, in that a rigorous description of a reactor's dynamics was derived in that the rate of change of reactivity was recognized as the proper control signal, and in that extensive experimental trials were conducted of these newly developed concepts on actual nuclear reactors. 43 refs., 118 figs., 11 tabs.

Bernard, J.A. (Massachusetts Inst. of Tech., Cambridge, MA (USA). Nuclear Reactor Lab.)

1989-09-01T23:59:59.000Z

394

DC to DC power converters and methods of controlling the same  

DOE Patents [OSTI]

A power generation system configured to provide direct current (DC) power to a DC link is described. The system includes a first power generation unit configured to output DC power. The system also includes a first DC to DC converter comprising an input section and an output section. The output section of the first DC to DC converter is coupled in series with the first power generation unit. The first DC to DC converter is configured to process a first portion of the DC power output by the first power generation unit and to provide an unprocessed second portion of the DC power output of the first power generation unit to the output section.

Steigerwald, Robert Louis; Elasser, Ahmed; Sabate, Juan Antonio; Todorovic, Maja Harfman; Agamy, Mohammed

2012-12-11T23:59:59.000Z

395

A Case Study of Modern PLC and LabVIEW Controls: Power Supply Controls for the ORNL ITER ECH Test Stand  

SciTech Connect (OSTI)

Power Supply Controls are being developed at Oak Ridge National Laboratory (ORNL) to test transmission line components of the Electron Cyclotron Heating (ECH) system, with a focus on gyrotrons and waveguides, in support of the International Thermonuclear Experimental Reactor (ITER). The control is performed by several Programmable Logic Controllers (PLC s) located near the different equipment. A technique of Supervisory Control and Data Acquisition (SCADA) is presented to monitor, control, and log actions of the PLC s on a PC through use of Allen Bradley s Remote I/O communication interface coupled with an Open Process Control/Object Linking and Embedding [OLE] for Process Control (OPC) Server/Client architecture. The OPC data is then linked to a National Instruments (NI) LabVIEW system for monitoring and control. Details of the architecture and insight into applicability to other systems are presented in the rest of this paper. Future integration with an EPICS (Experimental Physics Industrial Control System) based mini-CODAC (Control, Data Access and Communication) SCADA system is under consideration, and integration considerations will be briefly introduced.

Barker, Alan M [ORNL; Killough, Stephen M [ORNL; Bigelow, Tim S [ORNL; White, John A [ORNL; Munro Jr, John K [ORNL

2011-01-01T23:59:59.000Z

396

MULTI-WATT ELECTRIC POWER FROM A MICROFABRICATED PERMANENT-MAGNET GENERATOR  

E-Print Network [OSTI]

MULTI-WATT ELECTRIC POWER FROM A MICROFABRICATED PERMANENT-MAGNET GENERATOR S. Das1 , D. P. Arnold2 presents the design, fabrication, and characterization of permanent-magnet (PM) generators for use, coupled to a transformer and rectifier, delivers 1.1 W of DC electrical power to a resistive load

397

Proportional EMG Control of Ankle Plantar Flexion in a Powered Transtibial Prosthesis  

E-Print Network [OSTI]

The human calf muscle generates 80% of the mechanical work to walk throughout stance-phase, powered plantar flexion. Powered plantar flexion is not only important for walking energetics, but also to minimize the impact on ...

Wang, Jing

2013-01-01T23:59:59.000Z

398

Modeling of ECM Controlled Series Fan-powered VAV Terminal Units  

E-Print Network [OSTI]

Semi-empirical models for series fan-powered variable air volume terminal units (FPTUs) were developed based on models of the primary, plenum, fan airflow and the fan power consumption. The experimental setups and test procedures were developed...

Yin, Peng

2011-10-21T23:59:59.000Z

399

A test case for implementing feedback control in a micro hydro power plant.  

E-Print Network [OSTI]

??Micro-hydro turbines generate power for small villages and industries in Afghanistan. They usually produce less than 100 kW of power. Currently the flow into the… (more)

Suliman, Ahmad

2010-01-01T23:59:59.000Z

400

Fabrication and testing of an infrared spectral control component for thermophotovoltaic power conversion applications  

E-Print Network [OSTI]

Thermophotovoltaic (TPV) power conversion is the direct conversion of thermal radiation to electricity. Conceptually, TPV power conversion is a very elegant means of energy conversion. A thermal source emits a radiative ...

O'Sullivan, Francis M. (Francis Martin), 1980-

2004-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "rectifier power control" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


401

Optimizing the Configuration and Control of a Novel Human-Powered Energy Harvesting System  

E-Print Network [OSTI]

human foot-strikes and power low-power wearable systems in a self-sustaining manner. Dielectric the energy produced by a user's foot strikes and drive a target wearable system in a self-sustaining manner

Potkonjak, Miodrag

402

Control of a wind power system based on a tethered wing  

E-Print Network [OSTI]

, hydraulic systems, etc. The wind turbine are certainly playing a major role in creating renewable energies overcome the drawbacks of standard power generation systems like nuclear power, gas turbine generator

Paris-Sud XI, Université de

403

Dynamics, Optimization and Control of a Fuel Cell Based Combined Heat Power (CHP) System for Shipboard Applications  

E-Print Network [OSTI]

Dynamics, Optimization and Control of a Fuel Cell Based Combined Heat Power (CHP) System, a natural gas fuel processor system (FPS), a proton exchange membrane fuel cell (PEM-FC) and a catalytic) systems based on fuel cells and fuel processing technologies have great potential for future shipboard

Stefanopoulou, Anna

404

Abstract--The issue of controlled and reliable integration of distributed energy resources into microgrids and large power  

E-Print Network [OSTI]

resources (DER), many of them based on renewable energies, have experimented an unprecedented growth of the renewable energy sources, and its integration into power systems. One of the main technical issues to be addressed in the process of integration is the control and management of the non-dispatchable renewable

Cańizares, Claudio A.

405

Frequency Scalable Non-Linear Waveform Generator for Mixed-Simal Power-Factor-Correction IC Controller'  

E-Print Network [OSTI]

Frequency Scalable Non-Linear Waveform Generator for Mixed-Simal Power-Factor-Correction IC derives a family of digital non-linear waveform generators fundamental to the developement of an adaptive-Signal IC Gontroller Block Diagram frequency scalable non-linear waveform generators for the IC controller

406

Hybrid Control Network Intrusion Detection Systems for Automated Power Distribution Systems  

E-Print Network [OSTI]

Security protocols against cyber attacks in the distributioncyber security weak- ness and system fragility of power distribution

Parvania, Masood; Koutsandria, Georgia; Muthukumar, Vishak; Peisert, Sean; McParland, Chuck; Scaglione, Anna

2014-01-01T23:59:59.000Z

407

Fuel Cell Powered Vehicles Using Supercapacitors: Device Characteristics, Control Strategies, and Simulation Results  

E-Print Network [OSTI]

hydrogen fuel and can deliver high power for long periods, but has relatively poor dynamic response due to the compressor

Zhao, Hengbing; Burke, Andy

2010-01-01T23:59:59.000Z

408

REVIEW Of COMPUTERIZED PROCEDURE GUIDELINES FOR NUCLEAR POWER PLANT CONTROL ROOMS  

SciTech Connect (OSTI)

Computerized procedures (CPs) are recognized as an emerging alternative to paper-based procedures for supporting control room operators in nuclear power plants undergoing life extension and in the concept of operations for advanced reactor designs. CPs potentially reduce operator workload, yield increases in efficiency, and provide for greater resilience. Yet, CPs may also adversely impact human and plant performance if not designed and implemented properly. Therefore, it is important to ensure that existing guidance is sufficient to provide for proper implementation and monitoring of CPs. In this paper, human performance issues were identified based on a review of the behavioral science literature, research on computerized procedures in nuclear and other industries, and a review of industry experience with CPs. The review of human performance issues led to the identification of a number of technical gaps in available guidance sources. To address some of the gaps, we developed 13 supplemental guidelines to support design and safety. This paper presents these guidelines and the case for further research.

David I Gertman; Katya Le Blanc; Ronald L Boring

2011-09-01T23:59:59.000Z

409

On the Robust Control of DC-DC Converters: Application to a Hybrid Power  

E-Print Network [OSTI]

synthesis is performed for a hybrid power generation structure composed by a Fuel Cell and a Supercapacitor Inequalities, Fuel Cells, Supercapacitors, Hybrid Power Generation. 1. INTRODUCTION It is believed power generation system composed by a FC and a Supercapacitor (SC). A complete review of FC models

Boyer, Edmond

410

Power Electronics and Controls for Wind Turbine F. Blaabjerg, F. Iov, Z. Chen, K. Ma  

E-Print Network [OSTI]

was in the beginning based on a squirrel-cage induction generator connected directly to the grid. Power pulsations technologies used in wind turbine systems. I. INTRODUCTION In classical power systems, large power generation such as wind turbines, wave generators, photovoltaic (PV) generators, small hydro, fuel cells and gas

Chen, Zhe

411

Optimal control system design of an acid gas removal unit for an IGCC power plants with CO2 capture  

SciTech Connect (OSTI)

Future IGCC plants with CO{sub 2} capture should be operated optimally in the face of disturbances without violating operational and environmental constraints. To achieve this goal, a systematic approach is taken in this work to design the control system of a selective, dual-stage Selexol-based acid gas removal (AGR) unit for a commercial-scale integrated gasification combined cycle (IGCC) power plant with pre-combustion CO{sub 2} capture. The control system design is performed in two stages with the objective of minimizing the auxiliary power while satisfying operational and environmental constraints in the presence of measured and unmeasured disturbances. In the first stage of the control system design, a top-down analysis is used to analyze degrees of freedom, define an operational objective, identify important disturbances and operational/environmental constraints, and select the control variables. With the degrees of freedom, the process is optimized with relation to the operational objective at nominal operation as well as under the disturbances identified. Operational and environmental constraints active at all operations are chosen as control variables. From the results of the optimization studies, self-optimizing control variables are identified for further examination. Several methods are explored in this work for the selection of these self-optimizing control variables. Modifications made to the existing methods will be discussed in this presentation. Due to the very large number of candidate sets available for control variables and due to the complexity of the underlying optimization problem, solution of this problem is computationally expensive. For reducing the computation time, parallel computing is performed using the Distributed Computing Server (DCS®) and the Parallel Computing® toolbox from Mathworks®. The second stage is a bottom-up design of the control layers used for the operation of the process. First, the regulatory control layer is designed followed by the supervisory control layer. Finally, an optimization layer is designed. In this paper, the proposed two-stage control system design approach is applied to the AGR unit for an IGCC power plant with CO{sub 2} capture. Aspen Plus Dynamics® is used to develop the dynamic AGR process model while MATLAB is used to perform the control system design and for implementation of model predictive control (MPC).

Jones, D.; Bhattacharyya, D.; Turton, R.; Zitney, S.

2012-01-01T23:59:59.000Z

412

The 100,000 amp dc power supply for a staged hadron collider superferric magnet  

SciTech Connect (OSTI)

A 1.5 volt 100,000 amp DC switcher power supply was developed for testing a superferric magnet string at FNAL. This supply was used during testing as both the ramping supply and holding supply powering a single magnet load with a total load resistance of 0.7{micro} Ohms. The supply consists of ten paralleled switcher cells, powered by a 400 volt/600 Amp DC power supply. Each cell consists of an IGBT H-bridge driving a step-down transformer at a switching frequency of 2 kHz. The transformer has an effective turns ratio of 224:1. The secondary consists of 32 parallel single-turn full wave rectifier windings. The rectification is done with 64 Shottky diodes. Each cell is rated at 1.5 volts/10,000 amps. During this test each cell was operated as a constant power source without load current or field feedback. This paper will describe the design of the switcher cell and control system used during testing. We will also describe the next level of improvements to the current feedback system to improve the ramp control.

Hays, Steven L.; Claypool, Bradley; Foster, G.William; /Fermilab

2005-09-01T23:59:59.000Z

413

Control signal transmission through power supply cables of a 3-phase PWM motor  

E-Print Network [OSTI]

Modem process control systems often employ accurate position or speed controlled PWM motors, which require feedback data for the drive control loop. Current methods require an independently shielded cable for feedback data ...

Mendez, Jose A. (Jose Antonio Mendez Alcazar)

2006-01-01T23:59:59.000Z

414

The future of GPS-based electric power system measurements, operation and control  

SciTech Connect (OSTI)

Much of modern society is powered by inexpensive and reliable electricity delivered by a complex and elaborate electric power network. Electrical utilities are currently using the Global Positioning System-NAVSTAR (GPS) timekeeping to improve the network`s reliability. Currently, GPS synchronizes the clocks on dynamic recorders and aids in post-mortem analysis of network disturbances. Two major projects have demonstrated the use of GPS-synchronized power system measurements. In 1992, the Electric Power Research Institute`s (EPRI) sponsored Phase Measurements Project used a commercially available Phasor Measurements Unit (PMU) to collect GPS-synchronized measurements for analyzing power system problems. In 1995, Bonneville Power Administration (BPA) and Western Area Power Administration (WAPA) under DOE`s and EPRI`s sponsorship launched the Wide Area Measurements (WAMS) project. WAMS demonstrated GPS-synchronized measurements over a large area of their power networks and demonstrated the networking of GPS-based measurement systems in BPA and WAPA. The phasor measurement technology has also been used to conduct dynamic power system tests. During these tests, a large dynamic resistor was inserted to simulate a small power system disturbance.

Rizy, D.T. [Oak Ridge National Lab., TN (United States); Wilson, R.E. [Western Area Power Administration, Golden, CO (United States); Martin, K.E.; Litzenberger, W.H. [Bonneville Power Administration, Portland, OR (United States); Hauer, J.F. [Pacific Northwest National Lab., Richland, WA (United States); Overholt, P.N. [Dept. of Energy, Washington, DC (United States); Sobajic, D.J. [Electric Power Research Inst., Palo Alto, CA (United States)

1998-11-01T23:59:59.000Z

415

Fuel Cell Powered Vehicles Using Supercapacitors: Device Characteristics, Control Strategies, and Simulation Results  

E-Print Network [OSTI]

using supercapacitors than batteries. The simulation resultsload-level control for batteries because of the lower lossesthe DC/DC converter and batteries, but load level control is

Zhao, Hengbing; Burke, Andy

2010-01-01T23:59:59.000Z

416

Model predictive control system and method for integrated gasification combined cycle power generation  

DOE Patents [OSTI]

Control system and method for controlling an integrated gasification combined cycle (IGCC) plant are provided. The system may include a controller coupled to a dynamic model of the plant to process a prediction of plant performance and determine a control strategy for the IGCC plant over a time horizon subject to plant constraints. The control strategy may include control functionality to meet a tracking objective and control functionality to meet an optimization objective. The control strategy may be configured to prioritize the tracking objective over the optimization objective based on a coordinate transformation, such as an orthogonal or quasi-orthogonal projection. A plurality of plant control knobs may be set in accordance with the control strategy to generate a sequence of coordinated multivariable control inputs to meet the tracking objective and the optimization objective subject to the prioritization resulting from the coordinate transformation.

Kumar, Aditya; Shi, Ruijie; Kumar, Rajeeva; Dokucu, Mustafa

2013-04-09T23:59:59.000Z

417

Initial Studies on Actionable Control for Improving Small Signal Stability in Interconnected Power Systems  

SciTech Connect (OSTI)

Power consumption and demand continues to grow around the world. As the electric power grid continues to be put under more stress, the conditions of instability are more likely to occur. One cause of such instabilities is intearea oscillations, such as the oscillation that resulted in the August 10, 1996 blackout of the WECC. This paper explores different potential operations of different devices on the power system to improve the damping of these interarea oscillations using two different simulation models

Tuffner, Francis K.; Huang, Zhenyu; Zhou, Ning; Guttromson, Ross T.; Jayantilal, Avnaesh

2010-06-14T23:59:59.000Z

418

Developement of a digitally controlled low power single phase inverter for grid connected solar panel.  

E-Print Network [OSTI]

?? The work consists in developing a power conversion unit for solar panel connected to the grid. This unit will be a single phase inverter… (more)

Marguet, Raphael

2010-01-01T23:59:59.000Z

419

Fuel Cell Powered Vehicles Using Supercapacitors: Device Characteristics, Control Strategies, and Simulation Results  

E-Print Network [OSTI]

Vehicles Using Supercapacitors -- Device Characteristics,With the emergence of large supercapacitors (also know asin conjunction with supercapacitors can create high power

Zhao, Hengbing; Burke, Andy

2010-01-01T23:59:59.000Z

420

Direct Cooled Ceramic Substrate for Thermal Control of Automotive Power Electronics.  

E-Print Network [OSTI]

??As electric vehicle technology develops, manufacturers would like to move toward hotter coolants for power electronic components to reduce system level costs. Thus, unique designs… (more)

Lowe, Kirk Townsend

2009-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "rectifier power control" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


421

Fuel Cell Powered Vehicles Using Supercapacitors: Device Characteristics, Control Strategies, and Simulation Results  

E-Print Network [OSTI]

of fuel cell/battery/supercapacitor hybrid power source for479 7. Soonil Jeon, Hyundai Supercapacitor Fuel Cell Hybridtechnology, fuel cell/supercapacitor hybrid fuel cell

Zhao, Hengbing; Burke, Andy

2010-01-01T23:59:59.000Z

422

Majority Dominance or Power-Sharing: Control of the Legislative Agenda in the Argentine Congress  

E-Print Network [OSTI]

Foundations of Public Policy in Argentina: A Transactionsin Argentina: Post-war Counterrevolutionary Policies andArgentina the president has formal power to initiate policy

Ferretti, Natalia

2010-01-01T23:59:59.000Z

423

Distributed Low-Complexity Controller for Wind Power Plant in Derated Benjamin Biegel Daria Madjidian Vedrana Spudic Anders Rantzer Jakob Stoustrup  

E-Print Network [OSTI]

Distributed Low-Complexity Controller for Wind Power Plant in Derated Operation Benjamin Biegel Daria Madjidian Vedrana Spudi´c Anders Rantzer Jakob Stoustrup Abstract-- We consider a wind power plant of megawatt wind turbines operating in derated mode. When operating in this mode, the wind power plant

424

Bulk Power System Dynamics and Control V, August 26-31, 2001, Onomichi, Japan Strong Resonance Effects in Normal Form Analysis  

E-Print Network [OSTI]

Bulk Power System Dynamics and Control V, August 26-31, 2001, Onomichi, Japan Strong Resonance Engineering Department University of Wisconsin, Madison, WI 53706 USA dobson@engr.wisc.edu Abstract: Power resonance occurring in the power system linearization. Moreover, the changes in the coefficients when

425

U.S. Seafood Safe and Unaffected by Radiation Contamination from Japanese Nuclear Power Plant Incident; U.S. Monitoring Control Strategy Explained  

E-Print Network [OSTI]

U.S. Seafood Safe and Unaffected by Radiation Contamination from Japanese Nuclear Power Plant about radiation contamination from the Japanese nuclear power plant incident and on the control potential routes by which seafood contaminated with radionuclides from the Japanese nuclear power plant

426

Redundant Sensor Calibration and Estimation for Monitoring and Control of Nuclear Power Plants Xin Jin, Asok Ray and Robert M. Edwards  

E-Print Network [OSTI]

Redundant Sensor Calibration and Estimation for Monitoring and Control of Nuclear Power Plants Xin@engr.psu.edu INTRODUCTION Performance, reliability and safety of nuclear power plants depend upon validity and accuracy are installed with redundancy in nuclear power plants. Redundancy can be classified into two groups: direct

Ray, Asok

427

1558 IEEE TRANSACTIONS ON MAGNETICS,VOL. 29, NO. 2, MARCH 1993 Control of an Induction Heat Treatment by the Measure of Power  

E-Print Network [OSTI]

heated. The heating stage is controlled by regulatingboth the power supplied to the coil and the linear1558 IEEE TRANSACTIONS ON MAGNETICS,VOL. 29, NO. 2, MARCH 1993 Control of an Induction Heat Treatment by the Measure of Power D. Melaab, 0.Longeot ENSAM, LAMMAR, 33405 Bordeaux, France L. Krahenbiihl

Paris-Sud XI, Université de

428

Abstract--This paper revisits the possibility of controlling the power system entirely by means of price signals. It expands on  

E-Print Network [OSTI]

Abstract-- This paper revisits the possibility of controlling the power system entirely by means, be made to work with some caveats. Index Terms--Power system control, pricing, market design. I. An important extension of the work of Schweppe was provided by William Hogan, who in 1992 introduced

429

Active Power Control Testing at the U.S. National Wind Technology Center (NWTC) (Presentation)  

SciTech Connect (OSTI)

In order to keep the electricity grid stable and the lights on, the power system relies on certain responses from its generating fleet. This presentation evaluates the potential for wind turbines and wind power plants to provide these services and assist the grid during critical times.

Ela, E.

2011-01-01T23:59:59.000Z

430

IEEE PES WM Panel on Modeling, Simulation and Applications of FACTS Controllers in Angle and Voltage Stability Studies, Singapore, Jan. 2000 Power Flow and Transient Stability Models of FACTS Controllers  

E-Print Network [OSTI]

, the Static Syn- chronous Source Series Compensator SSSC, and the Uni edPower FlowController UPFC appropriateIEEE PES WM Panel on Modeling, Simulation and Applications of FACTS Controllers in Angle and Voltage Stability Studies, Singapore, Jan. 2000 Power Flow and Transient Stability Models of FACTS

Cañizares, Claudio A.

431

Internal, powerful others, and chance locus of control as related to performance in a concept identification task  

E-Print Network [OSTI]

fcclfill . ent of thc require!!cent for tn: drgr=. c f RASTER OF SCIENCE August 1975 Major Subject: Psychology L INTERNAL, POWERFUL OTHERS, AND CHANCE LOCUS OF CONTROL AS RELATED TO PERFORMANCE IN A CONCEPT IDENTIFICATION TASK A Thesis Thomas Gray... INIHODUCTION Hypotheses 10 METHOD 12 Subj ects Procedures 12 12 Instructional Set 13 Transfer Instructions Miterisls RES UI. 'I S 39 DISCUSSION 7F Ro"'ERFNCES 37 APPENDICES 1. Stimulus Materials In Acquisition 2. Stimulus Materials In Transfer...

Allen, Thomas Gray

1975-01-01T23:59:59.000Z

432

Robust Power System Stabiliser Design Using Minimax Control Approach: Validation using Real-time Digital Simulation  

E-Print Network [OSTI]

using IQCs. Generator speed is used as the output feedback variable for the controller, due to the fact the problem of designing a robust controller for a generator connected to a multi-machine grid system. To make the controller robust against parameter varia- tions around the operating point, system parameter variations, due

Pota, Himanshu Roy

433

www.jatit.org ARTIFICIAL INTELLIGENCE BASED TUNING OF SVC CONTROLLER FOR CO-GENERATED POWER SYSTEM  

E-Print Network [OSTI]

The gain of SVC depends upon the type of reactive power load for optimum performance. As the load and input wind power conditions are variable, the gain setting of SVC needs to be adjusted or tuned. In this paper, an ANN based approach has been used to tune the gain parameters of the SVC controller over a wide range of load characteristics. The multi-layer feed-forward ANN tool with the error backpropagation training method is employed. Loads have been taken as the function of voltage. Analytical techniques have mostly been based on impedance load reduced network models, which suffer from several disadvantages, including inadequate load representation and lack of structural integrity. The ability of ANNs to spontaneously learn from examples, reason over inexact and fuzzy data and provide adequate and quick responses to new information not previously stored in memory has generated high performance dynamical system with unprecedented robustness. ANNs models have been developed for different hybrid power system configurations for tuning the proportional-integral controller for SVC. Transient responses of different autonomous configurations show that SVC controller with its gained tuned by the ANNs provide optimum system performance for a variety of loads.

Vinod Kumar

434

Analysis and design of closed-loop control of power electronic converter systems  

E-Print Network [OSTI]

filter system to cancel neutral current harmonic (IOOA) in a threephase four-wire electric distribution system. (b)Input power factor correction and harmonic reduction stage of a commercially available electronic ballast (12OV, 64W) for fluorescent...

Huang, Yenchin

2012-06-07T23:59:59.000Z

435

Fuel Cell Powered Vehicles Using Supercapacitors: Device Characteristics, Control Strategies, and Simulation Results  

E-Print Network [OSTI]

May 13 - 16, Appendix I Fuel cell hybrid vehicles with load510 cm 2 ) Appendix II Fuel cell vehicles with power assistcm 2 ) Appendix III Fuel cell vehicles with load leveling

Zhao, Hengbing; Burke, Andy

2010-01-01T23:59:59.000Z

436

Control and design of multi-use induction machines : traction, generation, and power conversion  

E-Print Network [OSTI]

An electrical machine can be made to convert electrical power while performing in its primary role of transforming electrical energy into mechanical energy. One way of doing this is to design the machine with multiple ...

Avestruz, Al-Thaddeus

2006-01-01T23:59:59.000Z

437

Novel Controls for Economic Dispatch of Combined Cooling, Heating and Power (CCHP) Systems  

Broader source: Energy.gov [DOE]

The emergence of technologies that efficiently convert heat into cooling, such as absorption chillers, has opened up many new opportunities and markets for combined heat and power systems. These...

438

E-Print Network 3.0 - active power control Sample Search Results  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

and Information Sciences ; Engineering 12 It is not just a job its a WINDTEST Wind Energy with Power Plant Properties?WINDTEST Summary: -Wilhelm-Koog GmbH 12;1. Introduction...

439

Observer-based control of a tethered wing wind power system: indoor real-time experiment  

E-Print Network [OSTI]

. A third solution is to use power kites as renewable energy generators [3]. One can cite the "Kite Wind Generator" of Politecnico di Torino [6], [5] and the "Laddermill" of the Delft University of Technology [13

Paris-Sud XI, Université de

440

A neuromuscular-model based control strategy for powered ankle-foot prostheses  

E-Print Network [OSTI]

In the development of a powered ankle-foot prosthesis, it is desirable to provide the prosthesis with the ability to exhibit human-like dynamics. A simple method for achieving this goal involves trajectory tracking, where ...

Eilenberg, Michael Frederick

2009-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "rectifier power control" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


441

PERFORMANCE ENHANCEMENT OF WIND TURBINE POWER REGULATION BY SWITCHED LINEAR CONTROL  

E-Print Network [OSTI]

W. It is anticipated that the next generation of wind turbines which are presently being developed will include large at high power levels, with a consequent reduction in drive-train loads. It achieves very similar

Duffy, Ken

442

The Guy at the Controls: Labor Quality and Power Plant Efficiency  

E-Print Network [OSTI]

of power plants. Although electricity generation is a fuelplant managers both suggest that labor poli- cies in electricity generationplant that had been built by the government-owned Central Electricity Generation

Bushnell, Jim B; Wolfram, Catherine D

2007-01-01T23:59:59.000Z

443

Emissions, Monitoring, and Control of Mercury from Subbituminous Coal-Fired Power Plants - Phase II  

SciTech Connect (OSTI)

Western Research Institute (WRI), in conjunction with Western Farmers Electric Cooperative (WFEC), has teamed with Clean Air Engineering of Pittsburgh PA to conduct a mercury monitoring program at the WEFC Hugo plant in Oklahoma. Sponsored by US Department of Energy Cooperative Agreement DE-FC-26-98FT40323, the program included the following members of the Subbituminous Energy Coalition (SEC) as co-sponsors: Missouri Basin Power Project; DTE Energy; Entergy; Grand River Dam Authority; and Nebraska Public Power District. This research effort had five objectives: (1) determine the mass balance of mercury for subbituminous coal-fired power plant; (2) assess the distribution of mercury species in the flue gas (3) perform a comparison of three different Hg test methods; (4) investigate the long-term (six months) mercury variability at a subbituminous coal-fired power plant; and (5) assess operation and maintenance of the Method 324 and Horiba CEMS utilizing plant personnel.

Alan Bland; Jesse Newcomer; Allen Kephart; Volker Schmidt; Gerald Butcher

2008-10-31T23:59:59.000Z

444

ROBUST CONTROL ANALYSIS USING REAL-TIME IMPLEMENTATION OF A HYBRID FUEL CELL POWER GENERATION SYSTEM  

E-Print Network [OSTI]

is performed for a hybrid Fuel Cell/Supercapacitor generation system with power management, realized through converters interfacing the Fuel Cell (FC) and the Supercapacitor (SC) with the system electrical load

Paris-Sud XI, Université de

445

Model predictive control of power plant superheater comparison of multi model and nonlinear approaches  

E-Print Network [OSTI]

, the responses to large load demand changes (between 50 and 100% of boiler rated power) typical of today. This increases the plant efficiency because efficiency is proportional to the superheated steam temperature

Johansen, Tor Arne

446

Regulatory Control of Vehicle and Power Plant Emissions: How Effective and at What Cost?  

E-Print Network [OSTI]

Passenger vehicles and power plants are major sources of greenhouse gas emissions. While economic analyses generally indicate that a broader market-based approach to greenhouse gas reduction would be less costly and more ...

Paltsev, S.

447

Extremum seeking control techniques applied to photovoltaic systems with multimodal power curves  

E-Print Network [OSTI]

) Current(A) 0 200 320025 I-V curve P-V curve VMPP Power(W) 1000 Fig. 1. Photovoltaic cell I-V and P nonlinear steady-state characteristics, expressed as either current versus voltage (the so called I-V curve), or as power versus voltage (the P-V curve, like the one in Fig. 1). The I-V and P-V curves of a PV system vary

Boyer, Edmond

448

Technological developments to improve combustion efficiency and pollution control in coal-fired power stations in Japan  

SciTech Connect (OSTI)

In 1975, approximately 60 percent of all power generating facilities in Japan were oil fired. The oil crisis in the 1970s, however, led Japanese power utilities to utilize alternatives to oil as energy sources, including nuclear power, coal, LNG, and others. As a result, by 1990, the percentage of oil-fired power generation facilities had declined to approximately 31 percent. On the other hand, coal-fired power generation, which accounted for 5.7 percent of all facilities in 1975, increased its share to 7.5 percent in 1990 and is anticipated to expand further to 13 percent by the year 2000. In order to increase the utilization of coal-fired power generation facilities in Japan, it is necessary to work out thorough measures to protect the environment, mainly to control air pollution. The technologies that are able to do this are already available. The second issue is how to improve efficiency. In this chapter, I would like to introduce technological developments that improve efficiency and that protect the environment which have been implemented in coal-fired power stations in Japan. Examples of the former, include the atmospheric fluidized bed combustion (AFBC) boiler, the pressurized fluidized bed combustion (PFBC) boiler, and the ultra super-critical (USC) steam condition turbine, and an example of the latter is the dry deSOx/deNOx. Although details are not provided in this paper, there are also ongoing projects focusing on the development of technology for integrated gasification combined cycle generation, fuel cells and other systems undertaken by the government, i.e., the Ministry of International Trade and Industry (MITI), which is committed to the New Energy and Industrial Technology Development Organization (NEDO).

Miyasaka, Tadahisa

1993-12-31T23:59:59.000Z

449

PhotoVoltaic distributed generation for Lanai power grid real-time simulation and control integration scenario.  

SciTech Connect (OSTI)

This paper discusses the modeling, analysis, and testing in a real-time simulation environment of the Lanai power grid system for the integration and control of PhotoVoltaic (PV) distributed generation. The Lanai Island in Hawaii is part of the Hawaii Clean Energy Initiative (HCEI) to transition to 30% renewable green energy penetration by 2030. In Lanai the primary loads come from two Castle and Cook Resorts, in addition to residential needs. The total peak load profile is 12470 V, 5.5 MW. Currently there are several diesel generators that meet these loading requirements. As part of the HCEI, Lanai has initially installed 1.2 MW of PV generation. The goal of this study has been to evaluate the impact of the PV with respect to the conventional carbon-based diesel generation in real time simulation. For intermittent PV distributed generation, the overall stability and transient responses are investigated. A simple Lanai 'like' model has been developed in the Matlab/Simulink environment (see Fig. 1) and to accommodate real-time simulation of the hybrid power grid system the Opal-RT Technologies RT-Lab environment is used. The diesel generators have been modelled using the SimPowerSystems toolbox swing equations and a custom Simulink module has been developed for the High level PV generation. All of the loads have been characterized primarily as distribution lines with series resistive load banks with one VAR load bank. Three-phase faults are implemented for each bus. Both conventional and advanced control architectures will be used to evaluate the integration of the PV onto the current power grid system. The baseline numerical results include the stable performance of the power grid during varying cloud cover (PV generation ramping up/down) scenarios. The importance of assessing the real-time scenario is included.

Robinett, Rush D., III; Kukolich, Keith (Opal RT Technologies, Montreal, Quebec, Canada); Wilson, David Gerald; Schenkman, Benjamin L.

2010-06-01T23:59:59.000Z

450

Simulation-based biagnostics and control for nuclar power plants. Progress report, April 15, 1992--April 14, 1993  

SciTech Connect (OSTI)

Advanced simulation-based diagnostics and control guidance systems for the identification and management of off-normal transient events in nuclear power plants is currently under investigation. To date a great deal of progress has been made in effectively and efficiently combining information obtained through fuzzy pattern recognition and macroscopic mass and energy inventory analysis for use in multiple failure diagnostics. Work has also begun on the unique problem of diagnostics and surveillance methodologies for advanced passively-safe reactors systems utilizing both statistical and fuzzy information. Plans are also being formulated for the development of deterministic optimal control algorithms combined with Monte Carlo incremental learning algorithms to be used for the flexible and efficient control of reactor transients.

Lee, J.C.

1993-01-01T23:59:59.000Z

451

Power Control and Optimization of Photovoltaic and Wind Energy Conversion Systems /  

E-Print Network [OSTI]

77 5.2 Wind Energy Conversion System . . . . .Optimization and Control in Wind Energy Conversion SystemsAC matrix con- verter for wind energy conversion system,” in

Ghaffari, Azad

2013-01-01T23:59:59.000Z

452

Fuel Cell Powered Vehicles Using Supercapacitors: Device Characteristics, Control Strategies, and Simulation Results  

E-Print Network [OSTI]

and simulation of a PEM fuel cell/ultra-capacitor hybridOptimal Control for a PEM Fuel Cell Hybrid Vehicle,

Zhao, Hengbing; Burke, Andy

2010-01-01T23:59:59.000Z

453

Capacitor charging FET switcher with controller to adjust pulse width  

DOE Patents [OSTI]

A switching power supply includes an FET full bridge, a controller to drive the FETs, a programmable controller to dynamically control final output current by adjusting pulse width, and a variety of protective systems, including an overcurrent latch for current control. Power MOSFETS are switched at a variable frequency from 20-50 kHz to charge a capacitor load from 0 to 6 kV. A ferrite transformer steps up the DC input. The transformer primary is a full bridge configuration with the FET switches and the secondary is fed into a high voltage full wave rectifier whose output is connected directly to the energy storage capacitor. The peak current is held constant by varying the pulse width using predetermined timing resistors and counting pulses. The pulse width is increased as the capacitor charges to maintain peak current. A digital ripple counter counts pulses, and after the desired number is reached, an up-counter is clocked. The up-counter output is decoded to choose among different resistors used to discharge a timing capacitor, thereby determining the pulse width. A current latch shuts down the supply on overcurrent due to either excessive pulse width causing transformer saturation or a major bridge fault, i.e., FET or transformer failure, or failure of the drive circuitry.

Mihalka, Alex M. (Livermore, CA)

1986-01-01T23:59:59.000Z

454

The VIKING Project: An Initiative on Resilient Control of Power Networks  

E-Print Network [OSTI]

; control centers and their computers; connec- tions for software maintenance and remote diagnostic from system vendors; communication to other control centers; the office LANs and their systems; firewalls is to enhance data integrity, reliability and robustness of SCADA systems through the development

Johansson, Karl Henrik

455

CHANCE CONSTRAINED OPTIMAL POWER FLOW: RISK-AWARE NETWORK CONTROL UNDER UNCERTAINTY  

E-Print Network [OSTI]

which compromises stability. Smart grid goals include a commitment to large penetration of highly control sophistication and careful long-term planning. Nevertheless, the grid is under growing stress generation (coal, gas and hy- dro plants) over control areas of transmission networks, can result in grid

Bienstock, Daniel

456

On Kalman Filtering with Fading Wireless Channels Governed by Power Control  

E-Print Network [OSTI]

. In deriving the optimal power allocation laws, both statistical channel information and full channel This research was supported under Australian Research Council's Discovery Projects funding scheme (project sockets, there is a need for energy conservation. Even though energy harvesting is frequently considered

457

An Analytical Approach for Closed-Loop Power Control Error Estimations in CDMA Cellular Systems  

E-Print Network [OSTI]

(PCE). The power emitted by a mobile terminal is limited by tech- nological and normative constraints con- tributes to PCE. The distribution of PCE is often assumed log-normal [7],[8],[9], nevertheless, a more accurate statisti- cal characterization of PCE is desirable in order to evaluate the suitability

Abrardo, Andrea

458

A MAC Protocol for Wireless Ad Hoc Networks with Power Control  

E-Print Network [OSTI]

is an important factor in ad hoc networks. One way to conserve energy supported by the standard [1] is the power-hop neighborhood. Through many simulations we show that our algorithm outperforms the IEEE 802.11 standard, also IEEE 802.11 [1] has become the standard for Wire- less LAN's both in infrastructure and in ad hoc mode

459

Power Control and Optimization of Photovoltaic and Wind Energy Conversion Systems /  

E-Print Network [OSTI]

both AC drives and wind energy Turbine, shaft, and Gear BoxWind Energy Conversion Systems using Extremum Seeking Wind turbines (wind energy generation can be realized by capturing wind power at altitudes over the ground that cannot be reached by wind turbines.

Ghaffari, Azad

2013-01-01T23:59:59.000Z

460

Power-control based scheduling for commercial transatlantic flights Husam Fahmi, Seowoo Jang and Saewoong Bahk  

E-Print Network [OSTI]

the flight times/pattern of transatlantic flight to provide an efficient transmission schedule for all nodes. The scheme also dynamically changes transmission power according to traffic rate and node density expects high quality connectivity in any place and at any time. Cell towers utilizing 4G/3G technology

Bahk, Saewoong

Note: This page contains sample records for the topic "rectifier power control" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


461

Stochastic Six-Degree-of-Freedom Flight Simulator for Passively Controlled High-Power Rockets  

E-Print Network [OSTI]

are alternatively powered by hybrid motors using a liquid oxidizer, e.g., nitrous Oxide N2O and a solid fuel, e historical atmospheric data. The core simulation algorithm is a numerical integration of the rocket's equations of motion using the Runge-Kutta-Fehlberg method. The position of the rocket's center of mass

Bishop, Christopher M.

462

Underground nuclear power station using self-regulating heat-pipe controlled reactors  

DOE Patents [OSTI]

A nuclear reactor for generating electricity is disposed underground at the bottom of a vertical hole that can be drilled using conventional drilling technology. The primary coolant of the reactor core is the working fluid in a plurality of thermodynamically coupled heat pipes emplaced in the hole between the heat source at the bottom of the hole and heat exchange means near the surface of the earth. Additionally, the primary coolant (consisting of the working flud in the heat pipes in the reactor core) moderates neutrons and regulates their reactivity, thus keeping the power of the reactor substantially constant. At the end of its useful life, the reactor core may be abandoned in place. Isolation from the atmosphere in case of accident or for abandonment is provided by the operation of explosive closures and mechanical valves emplaced along the hole. This invention combines technology developed and tested for small, highly efficient, space-based nuclear electric power plants with the technology of fast-acting closure mechanisms developed and used for underground testing of nuclear weapons. This invention provides a nuclear power installation which is safe from the worst conceivable reactor accident, namely, the explosion of a nuclear weapon near the ground surface of a nuclear power reactor.

Hampel, Viktor E. (Pleasanton, CA)

1989-01-01T23:59:59.000Z

463

On the Network Lifetime of Wireless Sensor Networks Under Optimal Power Control  

E-Print Network [OSTI]

significantly reduces energy wastage by utilizing sleep cycles of the radio. In such networks, overhearing causes significant energy losses, especially if the network density is high. Our calculations demonstrate are powered by fixed energy resources such as a battery, and consequently, their utility is limited

Nasipuri, Asis

464

Delay Bounded Rate and Power Control in Energy Harvesting Wireless Networks  

E-Print Network [OSTI]

in environmentally powered wireless networks with bursty packet arrivals. Varying the size of the energy storage unit such as solar energy, mechanical energy and thermal energy have started finding use in wireless sensor networks, followed by an energy storage unit. The energy harvested by the front end is stored in the storage unit

Rajan, Dinesh

465

Optimal Power Management in Wireless Control Systems Konstantinos Gatsis, Alejandro Ribeiro and George J. Pappas  

E-Print Network [OSTI]

but a separation principle for finite horizon costs can be established [11], and optimal plant and transmission the sensor. The power allocated to these transmissions determines the probability of successful reception of transmissions protected with capacity achieving codes, conventional event-triggered policies are recovered

Pappas, George J.

466

The slow start power controlled MAC protocol for mobile ad hoc networks and its performance analysis  

E-Print Network [OSTI]

is achieved by allowing more transmissions to take place simultaneously. The slow start principle used energy consumption and increase network throughput and lifetime. In our scheme the transmission power used for the RTS frames is not constant, but follows a slow start principle. The CTS frames, which

Varvarigo, Emmanouel "Manos"

467

An underground nuclear power station using self-regulating heat-pipe controlled reactors  

DOE Patents [OSTI]

A nuclear reactor for generating electricity is disposed underground at the bottom of a vertical hole that can be drilled using conventional drilling technology. The primary coolant of the reactor core is the working fluid in a plurality of thermodynamically coupled heat pipes emplaced in the hole between the heat source at the bottom of the hole and heat exchange means near the surface of the earth. Additionally, the primary coolant (consisting of the working fluid in the heat pipes in the reactor core) moderates neutrons and regulates their reactivity, thus keeping the power of the reactor substantially constant. At the end of its useful life, the reactor core may be abandoned in place. Isolation from the atmosphere in case of accident or for abandonment is provided by the operation of explosive closures and mechanical valves emplaced along the hole. This invention combines technology developed and tested for small, highly efficient, space-based nuclear electric power plants with the technology of fast- acting closure mechanisms developed and used for underground testing of nuclear weapons. This invention provides a nuclear power installation which is safe from the worst conceivable reactor accident, namely, the explosion of a nuclear weapon near the ground surface of a nuclear power reactor. 5 figs.

Hampel, V.E.

1988-05-17T23:59:59.000Z

468

Modeling and Control of Co-generation Power Plants: A Hybrid System Approach  

E-Print Network [OSTI]

cycle is driven by some fossil fuel (usually natural gas) and produces electric power via expansion of the gas turbine and generates both electricity and steam for the industrial processes. Clearly, the liberalization of the energy market has promoted the need of operating CCPPs in the most efficient way

Ferrari-Trecate, Giancarlo

469

Power-Aware Control Speculation through Selective Throttling Juan L. Aragn1  

E-Print Network [OSTI]

@ac.upc.es Abstract With the constant advances in technology that lead to the increasing of the transistor count 28% of the power dissipated by a typical processor due to the useless activities performed% on average) is due to mis- speculated instructions that waste energy performing useless activities

Gupta, Rajiv

470

Fuzzy Based Energy Management Control of A Hybrid Fuel Cell Auxiliary Power System  

E-Print Network [OSTI]

battery auxiliary power unit (APU) for remote applications where a fuel cell is the main energy source for decentralized or distributed energy production, such as telecom, remote sites or even for military applications by hydrogen cartridges a fuel cell has nearly no noise operation, providing electricity and heat with water

Simões, Marcelo Godoy

471

The Power of Friction: Quantifying the ``Goodness'' of Frictional Grasps \\Lambda  

E-Print Network [OSTI]

The Power of Friction: Quantifying the ``Goodness'' of Frictional Grasps \\Lambda Marek Teichmann of fingers, coefficient of friction and the the goodness of a grasp. In particular, we give a general framework for defining a grasp metric that takes friction into account. Our approach rectifies a flaw

Mishra, Bud

472

A Harmonically-Terminated Two-Gram Low-Power Rectenna on a Flexible Substrate  

E-Print Network [OSTI]

. Daniel G. Kuester, and Prof. Zoya Popovi´c Dept. of Electrical, Computer and Energy Engineering, or harvested from already available sources, which can be broadband [5], [2]. Modulated transmission has also, or rectenna, is used to receive and rectify power. Many rectennas are fabricated on microwave substrates

Popovic, Zoya

473

Electronic Power Conversion System for an Advanced Mobile Generator Set Leon M. Tolbert1,3  

E-Print Network [OSTI]

. The military generator set uses an internal combustion diesel engine to drive a radial-gap permanent magnet. The variable frequency, variable voltage produced by the permanent magnet alternator is diode-rectified to dc synchronous machines are presently used to convert the mechanical power of the rotating shaft into three

Tolbert, Leon M.

474

Assessment of energy and economic impacts of particulate-control technologies in coal-fired power generation  

SciTech Connect (OSTI)

Under contract to Argonne National Laboratory, Midwest Research Institute has derived models to assess the economic and energy impacts of particulate-control systems for coal-fired power plants. The models take into account the major functional variables, including plant size and location, coal type, and applicable particulate-emission standards. The algorithms obtained predict equipment and installation costs, as well as operating costs (including energy usage), for five control devices: (1) cold-side electrostatic precipitators, (2) hot-side electrostatic precipitators, (3) reverse-flow baghouses, (4) shake baghouses, and (5) wet scrubbers. A steam-generator performance model has been developed, and the output from this model has been used as input for the control-device performance models that specify required design and operating parameters for the control systems under study. These parameters then have been used as inputs to the cost models. Suitable guideline values have been provided for independent variables wherever necessary, and three case studies are presented to demonstrate application of the subject models. The control-equipment models aggregate the following cost items: (1) first costs (capital investment), (2) total, first-year annualized costs, and (3) integrated cost of ownership and operation over any selected plant lifetime. Although the models have been programmed for rapid computation, the algorithms can be solved with a hand calculator.

Not Available

1980-04-01T23:59:59.000Z

475

FPGA-Based Spectral Envelope Preprocessor for Power Monitoring and Control  

E-Print Network [OSTI]

Smart Grid and Smart Meter initiatives seek to enable energy providers and consumers to intelligently manage their energy needs through real-time monitoring, analysis, and control. We have developed an inexpensive FPGA ...

Remscrim, Zachary N.

476

Power System Dynamics as Primal-Dual Algorithm for Optimal Load Control  

E-Print Network [OSTI]

in the Proceedings of the 3rd IEEE International Conference on Smart Grid Communica- tions, Tainan City, Taiwan- based load control does not require communication to a centralized grid operator, and is thus suitable for

Low, Steven H.

477

Synchronization and Power Sharing for Droop-Controlled Inverters in Islanded Microgrids  

E-Print Network [OSTI]

. Simpson-Porco, Florian D¨orfler, Francesco Bullo a a Center for Control, Dynamical Systems. Simpson-Porco), dorfler@engineering.ucsb.edu (Florian D¨orfler), bullo@engineering.ucsb.edu (Francesco

Bullo, Francesco

478

Innovative Distributed Power Grid Interconnection and Control Systems: Final Report, December 11, 2000 - August 30, 2005  

SciTech Connect (OSTI)

The contract goal was to further advance distributed generation in the marketplace by making installations more cost-effective and compatible with existing systems. This was achieved by developing innovative grid interconnection and control systems.

DePodesta, K.; Birlingmair, D.; West, R.

2006-03-01T23:59:59.000Z

479

Gain-scheduled controller design for load-following in static space nuclear power systems  

E-Print Network [OSTI]

of variations in the fuel temperature reactivity feedback coeficient on the load-following capabilities of the SNPS. Robustness analysis results of the gain-scheduled compensator demonstrate that the proposed control concept exhibits a significant degree...

Onbasioglu, Fetiye Ozlem

1993-01-01T23:59:59.000Z

480

Design, Modeling, and Control of Three-Port Converters for Solar Power Applications.  

E-Print Network [OSTI]

??This paper describes the results of research into multi-port converter design and control, specifically a pair of three-port topologies based on the half-bridge and full-bridge… (more)

Reese, Justin M

2007-01-01T23:59:59.000Z

Note: This page contains sample records for the topic "rectifier power control" from the National Library of EnergyBeta (NLEBeta).
While these samples are representative of the content of NLEBeta,
they are not comprehensive nor are they the most current set.
We encourage you to perform a real-time search of NLEBeta
to obtain the most current and comprehensive results.


481

Nanoscale sensing methodology via functional control of an ion channel-forming peptide, Gramicidin A  

E-Print Network [OSTI]

from a bridge rectifier using semiconductor diodes (middle);full-wave bridge rectifier based on semiconductor diodes andfull-wave bridge rectifier based on semiconductor diodes and

Macrae, Michael X.

2011-01-01T23:59:59.000Z

482

E-Print Network 3.0 - averaging current-mode rectifiers Sample...  

Broader source: All U.S. Department of Energy (DOE) Office Webpages (Extended Search)

ON POWER ELECTRONICS, VOL. 19, NO. 6, NOVEMBER 2004 A Comparison of Piezoelectric Transformer Summary: from (15) and (16). Taking into account that at (19) The average output...

483

Operational Impacts of Wind Energy Resources in the Bonneville Power Administration Control Area - Phase I Report  

SciTech Connect (OSTI)

This report presents a methodology developed to study the future impact of wind on BPA power system load following and regulation requirements. The methodology uses historical data and stochastic processes to simulate the load balancing processes in the BPA power system, by mimicking the actual power system operations. Therefore, the results are close to reality, yet the study based on this methodology is convenient to conduct. Compared with the proposed methodology, existing methodologies for doing similar analysis include dispatch model simulation and standard deviation evaluation on load and wind data. Dispatch model simulation is constrained by the design of the dispatch program, and standard deviation evaluation is artificial in separating the load following and regulation requirements, both of which usually do not reflect actual operational practice. The methodology used in this study provides not only capacity requirement information, it also analyzes the ramp rate requirements for system load following and regulation processes. The ramp rate data can be used to evaluate generator response/maneuverability requirements, which is another necessary capability of the generation fleet for the smooth integration of wind energy. The study results are presented in an innovative way such that the increased generation capacity or ramp requirements are compared for two different years, across 24 hours a day. Therefore, the impact of different levels of wind energy on generation requirements at different times can be easily visualized.

Makarov, Yuri V.; Lu, Shuai

2008-07-15T23:59:59.000Z

484

Maximizing Power Output in Homogeneous Charge Compression Ignition (HCCI) Engines and Enabling Effective Control of Combustion Timing  

E-Print Network [OSTI]

HCCI Engine for Power Generation, ASME IC Engine Conference,Engines for Power Generation , ASME IC Engine Conference,Engine for Power Generation”, ASME IC Engine Conference,

Saxena, Samveg

2011-01-01T23:59:59.000Z

485

2013 IREP Symposium-Bulk Power System Dynamics and Control -IX (IREP), August 25-30, 2013, Rethymnon, Greece Active network management: planning under  

E-Print Network [OSTI]

]. Such incentives have resulted in the on-going installation of wind and solar power generation resources2013 IREP Symposium-Bulk Power System Dynamics and Control -IX (IREP), August 25-30, 2013 In Europe, concern about the environmental impact of the electricity industry is currently driving

Ernst, Damien

486

Bulk Power System Dynamics and Control -VII, August 19-24, 2007, Charleston, South Carolina, USA Dynamics of a Microgrid Supplied by Solid Oxide Fuel Cells1  

E-Print Network [OSTI]

. The results of an example in which two SOFC plants provide power to a microgrid are presented. The simulation1 Bulk Power System Dynamics and Control - VII, August 19-24, 2007, Charleston, South Carolina, USA, but is not concerned with the thermal dynamics. A DC-DC boost converter interfaces the SOFC stack to a DC bus, where

Hiskens, Ian A.

487

An Integrated Scheme for Anomaly Identification and Automatic Control of Nuclear Power Plants Xin Jin, Robert M. Edwards and Asok Ray  

E-Print Network [OSTI]

An Integrated Scheme for Anomaly Identification and Automatic Control of Nuclear Power Plants Xin.edu INTRODUCTION Nuclear Power Plants (NPPs) are complex systems with many variables that require adjustment Jin, Robert M. Edwards and Asok Ray Department of Mechanical and Nuclear Engineering, The Pennsylvania

Ray, Asok

488

TAS: 89 0227: TAS Recovery Act - Optimization and Control of Electric Power Systems: ARRA  

SciTech Connect (OSTI)

The name SuperOPF is used to refer several projects, problem formulations and soft-ware tools intended to extend, improve and re-define some of the standard methods of optimizing electric power systems. Our work included applying primal-dual interior point methods to standard AC optimal power flow problems of large size, as well as extensions of this problem to include co-optimization of multiple scenarios. The original SuperOPF problem formulation was based on co-optimizing a base scenario along with multiple post-contingency scenarios, where all AC power flow models and constraints are enforced for each, to find optimal energy contracts, endogenously determined locational reserves and appropriate nodal energy prices for a single period optimal power flow problem with uncertainty. This led to example non-linear programming problems on the order of 1 million constraints and half a million variables. The second generation SuperOPF formulation extends this by adding multiple periods and multiple base scenarios per period. It also incorporates additional variables and constraints to model load following reserves, ramping costs, and storage resources. A third generation of the multi-period SuperOPF, adds both integer variables and a receding horizon framework in which the problem type is more challenging (mixed integer), the size is even larger, and it must be solved more frequently, pushing the limits of currently available algorithms and solvers. The consideration of transient stability constraints in optimal power flow (OPF) problems has become increasingly important in modern power systems. Transient stability constrained OPF (TSCOPF) is a nonlinear optimization problem subject to a set of algebraic and differential equations. Solving a TSCOPF problem can be challenging due to (i) the differential-equation constraints in an optimization problem, (ii) the lack of a true analytical expression for transient stability in OPF. To handle the dynamics in TSCOPF, the set of differential equations can be approximated or converted into equivalent algebraic equations before they are included in an OPF formulation. In Chapter 4, a rigorous evaluation of using a predefined and fixed threshold for rotor angles as a mean to determine transient stability of the system is developed. TSCOPF can be modeled as a large-scale nonlinear programming problem including the constraints of differential-algebraic equations (DAE). Solving a TSCOPF problem can be challenging due to (i) the differential-equation constraints in an optimization problem, (ii) the lack of a true analytical expression for transient stability constraint in OPF. Unfortunately, even the current best TSCOPF solvers still suffer from the curse of dimensionality and unacceptable computational time, especially for large-scale power systems with multiple contingencies. In chapter 5, thse issues will be addressed and a new method to incorporate the transient stability constraints will be presented.

Chiang, Hsiao-Dong

2014-02-01T23:59:59.000Z

489

Systems and methods for providing power to a load based upon a control strategy  

DOE Patents [OSTI]

Systems and methods are provided for an electrical system. The electrical system, for example, includes a first load, an interface configured to receive a voltage from a voltage source, and a controller configured to receive the voltage through the interface and to provide a voltage and current to the first load. The controller may be further configured to, receive information on a second load electrically connected to the voltage source, determine an amount of reactive current to return to the voltage source such that a current drawn by the electrical system and the second load from the voltage source is substantially real, and provide the determined reactive current to the voltage source.

Perisic, Milun; Lawrence, Christopher P; Ransom, Ray M; Kajouke, Lateef A

2014-11-04T23:59:59.000Z

490

Joint delay and power control in single-server queueing systems  

E-Print Network [OSTI]

a non-monotonic curve of delay vs. load. This may lead to malfunctioning in end- to-end flow the service rate according to the input traffic load leads to an anomalous behavior in the delay-load curve/congestion control protocols, which are based on the assumption that delays increase with increasing load. We propose

491

CHANCE CONSTRAINED OPTIMAL POWER FLOW: RISK-AWARE NETWORK CONTROL UNDER UNCERTAINTY  

E-Print Network [OSTI]

which compromises stability. Smart grid goals include a commitment to large penetration of highly and careful long-term planning, with only very rare disruptions. However, the grid is under growing stress generation (coal, gas and hy- dro plants) over control areas of transmission networks, can result in grid

Bienstock, Daniel

492

Nonlinear Adaptive Control of Networked Power Generators with Remote Measurement Units  

E-Print Network [OSTI]

provided by Phasor Measurement Units (PMU). The proposed control system is designed in a robust way illustrate its good behavior, and suggest that the new measurement and data transmission devices can bring Measurement Units (PMU). These devices are far beyond SCADA, and let one envisage the use of real time remote

Paris-Sud XI, Université de

493

On the Failure of Power System Automatic Generation Control due to Measurement Noise  

E-Print Network [OSTI]

of the Supervisory Control and Data Acquisition (SCADA) system that resides in a centralized location (typically of service attacks, and resort to other malicious actions [2]. Various false data detection techniques based PMU measurements by spoofing the clocks that they use for synchronization [7]. Apart from malicious

Liberzon, Daniel

494

Nitrogen oxides emission control through reburning with biomass in coal-fired power plants  

E-Print Network [OSTI]

-furnace, combustion control technology for NOx reduction. Another environmental issue that needs to be addressed is the rapidly growing feedlot industry in the United States. The production of biomass from one or more animal species is in excess of what can safely...

Arumugam, Senthilvasan

2005-02-17T23:59:59.000Z

495

Bulk Power System Dynamics and Control VIII, August 1-6, 2010, Buzios, Rio de Janeiro, Brazil Impact of Delays on a Consensus-based Primary Frequency Control Scheme  

E-Print Network [OSTI]

by a Multi-Terminal HVDC Grid Jing Dai, Yannick Phulpin Sup´elec, France {jing.dai, yannick systems connected by a multi-terminal HVDC grid. We focus on a control scheme that mod- ifies the power current (HVDC) systems for bulk power transmission over long distances [3] and underground cable cross

Paris-Sud XI, Université de

496

System and Battery Charge Control for PV-Powered AC Lighting Systems  

SciTech Connect (OSTI)

This report reviews a number of issues specific to stand-alone AC lighting systems. A review of AC lighting technology is presented, which discusses the advantages and disadvantages of various lamps. The best lamps for small lighting systems are compact fluorescent. The best lamps for intermediate-size systems are high- or low-pressure sodium. Specifications for battery charging and load control are provided with the goal of achieving lamp lifetimes on the order of 16,000 to 24,000 hours and battery lifetimes of 4 to 5 years. A rough estimate of the potential domestic and global markets for stand-alone AC lighting systems is presented. DC current injection tests were performed on high-pressure sodium lamps and the test results are presented. Finally, a prototype system was designed and a prototype system controller (with battery charger and DC/AC inverter) was developed and built.

Kern, G.

1999-04-01T23:59:59.000Z

497

Novel Controls for Time-Dependent Economic Dispatch of Combined Cooling Heating and Power (CCHP)  

SciTech Connect (OSTI)

The research and development effort detailed in this report directly addresses the challenge of reducing U.S. industrial energy and carbon intensity by contributing to an increased understanding of potential CCHP technology, the CCHP market and the challenges of widespread adoption. This study developed a number of new tools, models, and approaches for the design, control, and optimal dispatch of various CCHP technologies. The UC Irvine campus served as a ‘living laboratory’ of new CCHP technologies and enabled the design and demonstration of several novel control methods. In particular, the integration of large scale thermal energy storage capable of shifting an entire day of cooling demand required a novel approach to the CCHP dispatch optimization. The thermal energy storage proved an economically viable resource which reduced both costs and emissions by enabling generators and chillers to operate under steady high efficiency conditions at all times of the day.

Samuelsen, Scott; Brouwer, Jack

2013-08-31T23:59:59.000Z

498

Single-Phase Inverter and Rectifier for High-Reliability Applications  

E-Print Network [OSTI]

and governments worldwide. In addition to finding these energy resources, new technologies are being sought to improve the efficiency of consuming the generated energy. Power Electronics is the key technology for both generation and the efficient consumption...

Harb, Souhib

2014-05-01T23:59:59.000Z

499

A Simple Algorithm for Closed-Loop Control of Stepping Motors IEE Proc. -Electr. Power Appl., (1995) Vol 142, No 1, pp 5-13.  

E-Print Network [OSTI]

A Simple Algorithm for Closed-Loop Control of Stepping Motors IEE Proc. - Electr. Power Appl of Reading Whiteknights PO Box 225 Reading RG6 2AY ABSTRACT Stepping motors are normally operated without feedback. A simple control algorithm is developed which allows a stepping motor to operate effectively

Grimbleby, James

500

Sparsity-Promoting Optimal Wide-Area Control of Power Networks Florian Dorfler, Mihailo R. Jovanovic, Michael Chertkov, and Francesco Bullo  

E-Print Network [OSTI]

Sparsity-Promoting Optimal Wide-Area Control of Power Networks Florian D¨orfler, Mihailo R of this document has been presented in [1]. Florian D¨orfler and Francesco Bullo are with the Center for Control at LANL and with New Mexico Consortium, Los Alamos, NM 87544. Email: {dorfler

Jovanovic, Mihailo